I’m a 37-year-old marketing manager, and for about three years now, I have not been well.
I used to be a healthy, active person. I ran a few times a week, I had a busy job and a busy life, and I handled both fine. Then I caught a virus. Nothing exotic, just a bad one, the kind of thing I expected to shake off in a week or two.
I never shook it off.
The acute illness passed, but something underneath it didn’t. What was left was a deep, heavy tiredness that no amount of rest seemed to touch. I’d sleep eight hours and wake up feeling like I hadn’t slept at all, I’d be running on empty by mid-afternoon, and if I pushed too hard in a given week, I’d pay for it with two or three days flat on the sofa.
This is what post-viral fatigue looks like from the inside… It isn’t ordinary tiredness.
It’s a body that used to recover and has somehow forgotten how.
I did the rounds.
Blood tests, thyroid, iron, vitamin D, a referral, then more blood tests, and everything came back normal. I tried pacing, rest, a long list of supplements, and a gentle exercise plan that quietly made things worse.
A few things helped at the edges, but slowly, without really deciding to, I shrank my life down to fit the energy I had.
I stopped running, and I stopped making plans.
Vagus nerve stimulation kept coming up in the online communities I’d ended up reading, often from people who seemed level-headed about it.
So I checked the company website, saw the 30-day money-back guarantee, and decided to run a proper experiment. Thirty days, a journal each day, and if nothing changed, I’d send the device back.
Here’s what actually happened.
Day 1–4: The Week Nothing Lifted
It came in a plain white box.
I clipped it onto my left ear while the coffee was brewing, set the intensity to a level I could just barely feel, and got on with my morning. The feeling was a faint tingle, nothing more.
For three days, nothing lifted.
Same heavy mornings, same empty tank by mid-afternoon, same sense of moving through the day in low gear.
I was already drafting the refund email in my head.
On day four, I read the manual properly and realised I’d been doing short sessions: the recommended duration was thirty minutes, and I’d been doing ten. So I wore it for a full hour while working that morning.
Around the forty-minute mark, something quiet happened.
My shoulders dropped away from my ears, my jaw unclenched, and the strange wired feeling that always sat underneath the exhaustion eased off. That feeling is hard to explain to anyone who hasn’t had it. You can be utterly drained and still feel switched on, like a tired engine that won’t idle down.
For the first time in a long while, the engine seemed to idle down.
I didn’t feel energetic, I just felt slightly less braced.
That was enough to make me keep going.
Day 8–12: The Afternoon That Didn't Collapse
By the second week, I was doing two sessions a day, thirty minutes in the morning and forty-five in the evening.
For three years, my afternoons had a cliff in them.
Somewhere around 2 PM my brain would simply go offline, and the rest of the day became something to survive rather than do.
On day eleven, I worked through to the early evening and realised the cliff hadn’t come.
I hadn’t crashed.
I sat there for a minute genuinely trying to work out what was different, because a normal afternoon without the collapse was so unfamiliar that it didn’t register at first.
It happened again the next day, and the day after. I want to be honest about what this was and wasn’t: I had not become energetic and I was not bouncing around.
I was simply not crashing, and after three years of crashing, that quietly felt enormous.
Day 16–22: Sleep That Did Something, and a Week I Didn't Pay For
Sleep had been the cruelest part of all of it.
I got my hours.
I just never got anything from them: eight hours in bed, and I’d wake up as tired as I’d gone down.
I’d been wearing the device for forty-five minutes before bed for two weeks. In week three, I started waking up and feeling like the sleep had actually done something. It wasn’t a dramatic, well-rested high. It was just the sense that my body had used the night to recover, instead of merely passing the time.
My Oura backed it up, with deep sleep and resting heart rate dropping overnight.
But the bigger test came later that week: I had a genuinely heavy stretch, a demanding few days at work followed by a busy weekend, the exact combination that would normally flatten me for three days afterwards.
It didn’t flatten me.
I was tired the next day, properly tired, but it was one normal day of tiredness, not a multi-day shutdown. For three years, every bit of effort came with a bill attached. That week, the bill was a fraction of what it used to be.
Day 23–26: I Went Down a Research Rabbit Hole
By week four, I’d stopped wondering whether this was working and started wanting to understand why.
I gave myself a Saturday afternoon with a coffee and a stack of open browser tabs.
Here’s what I pieced together.
The vagus nerve is the body’s main parasympathetic pathway, which is the “rest, digest, recover” system. It’s the longest cranial nerve, running from the brainstem down through the neck and into the heart, lungs, and digestive system. About 80% of its fibres are afferent, meaning they send signals up to the brain, and only 20% send signals down.
Here is the idea that reframed everything for me.
After a serious illness, the nervous system can stay stuck in a defensive, on-alert state, even long after the virus itself is gone. The body behaves as though it is still under threat. And when your vagal tone drops, the recovery system stays partly offline, and the body never quite gets the signal that it is safe to stand down and rebuild.
That would explain the thing that had baffled me for three years.
Rest never fixed me, because the system that is supposed to do the repair was itself stuck. I had been trying to recover with the recovery system switched off.
I want to be honest about the state of the evidence here.
Research specifically on vagus nerve stimulation for post-viral fatigue is still preliminary, and the research community is still working through it. What there is more solid research on is the technology’s effect on vagal activity, HRV, sleep, and the stress response.
The technology I was using is called Nurosym.
It’s an auricular vagus nerve stimulation, sends mild electrical signals through a branch of the vagus nerve that runs close to the skin in the outer ear. The signal travels up the nerve to the brainstem.
This kind of stimulation has been studied in many scientific studies, reviews, and important analyses.
A few numbers from that body of research stood out:
- A 48% reduction in reported tiredness, alongside improved energy
- A 61% increase in vagal activity
- A 30% improvement in reported sleep quality
- A 35% reduction in stress-response reactivity
I won’t pretend I read every paper, but it was enough to convince me that what I was experiencing wasn’t placebo or wishful thinking, and that there was a plausible mechanism behind it, even if the picture for my specific situation is still being filled in.
Day 30: What Changed
I want to be measured about this.
Thirty days is thirty days, this isn’t a cure, and I still have a body that needs looking after. Some days are still low.
But here’s where things landed:
- The afternoon crash that ran my life for three years now comes far less often, and far softer when it does
- I'm waking up and getting something back from my sleep, instead of just passing the night
- A heavy week no longer guarantees a multi-day shutdown afterwards
- My energy across the day is steadier, less of a tank emptying and more of a level I can rely on
- My Oura numbers have been quietly climbing for three weeks
And the one I didn’t expect, I’ve started making plans again.
For three years my calendar was deliberately empty, because I never knew which version of me would show up, so I’d simply stopped committing to things. In the last couple of weeks I’ve said yes to dinner, a friend’s birthday, and a weekend away.
Saying yes, and meaning it, is something I had quietly given up on.
Why Your Body Stays Stuck (And How This Helps)
The vagus nerve is the longest cranial nerve in the body.
It runs from the brainstem down through the neck and into the abdomen, branching into the heart, lungs, and digestive system. About 80% of its fibres are afferent, meaning they send signals up to the brain, and only 20% are efferent, sending signals down.
The vagus nerve runs the body’s recovery system, the side that handles rest, repair, and rebuilding. After a serious illness, or a long period of strain, that system can stay stuck in a defensive, on-alert setting. The body keeps behaving as though the threat is still present.
Vagal tone drops, and the recovery side stays partly switched off.
This is one reason post-viral fatigue is so resistant to ordinary rest. Rest only works if the recovery system is online to make use of it. If that system is itself stuck, you can rest for months and still not rebuild, because the machinery that does the rebuilding hasn’t been switched back on.
Auricular vagus nerve stimulation works by sending mild electrical signals through a branch of the vagus nerve that runs close to the skin in the outer ear. The signal travels up the nerve to the brainstem, which can help support the parasympathetic side of the nervous system.
It’s not a stimulant, and it’s not energy in a bottle.
It’s about helping the recovery side of the nervous system come back online, so the body has a chance to do the rebuilding it’s been unable to do on its own.
One thing worth saying plainly:
Lingering fatigue after an illness is always worth getting properly checked by a healthcare profesional, because it can have causes that need attention. Nothing here is medical advice, and a device like this is something to consider alongside proper care, not instead of it.
A Note on the Practical Side
If you’re thinking of trying one, here are a few things I wish someone had told me.
I paid full price, around €700, so it’s not cheap.
I later found out they run a remote research study you can sign up for. You fill out some forms, share your data, and you get around €40 off
(I wish I’d known before I clicked buy…)
You wear it clipped to your ear, and sessions run from 15 minutes up to two hours. I do thirty minutes in the morning while working and forty-five in the evening while reading or watching something. The sensation is a faint tingle, not painful. You can wear it while reading, watching TV, or working at a laptop.
My Honest Take
I’ve spent three years, and a lot of money, trying to recover from something that didn’t show up on a single test. Most of what I tried helped a little for a week or two, and then I was back to the heavy mornings and the afternoon cliff.
This one was different.
It hasn’t given me my old body back, because that’s not how this works, and I’m careful not to oversell it. But it’s given me afternoons that don’t collapse, sleep that does something, weeks that don’t cost me the weekend, and a calendar that has things in it again.
For the first time in three years, I feel like my body is slowly remembering how to recover.
That’s the most honest summary I can give.
Este artículo de blog tiene como objetivo ser informativo y no debe reemplazar el asesoramiento profesional en salud. Consulte siempre con un profesional de la salud para obtener asesoramiento personalizado.
Referencias
- Borges, U., Laborde, S., & Raab, M. (2019). Influence of transcutaneous vagus nerve stimulation on cardiac vagal activity: A randomized controlled trial. PLOS ONE, 14(10), e0223848.https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0223848
- Cao, R., et al. (2022). Accuracy assessment of Oura Ring nocturnal heart rate and heart rate variability. Journal of Medical Internet Research, 24(1), e27487.https://www.jmir.org/2022/1/e27487/
- Peuker, E. T., & Filler, T. J. (2002). The nerve supply of the human auricle. Clinical Anatomy, 15(1), 35–37.https://onlinelibrary.wiley.com/doi/abs/10.1002/ca.1089
- Redgrave, J., et al. (2018). Safety and tolerability of transcutaneous vagus nerve stimulation in humans. Brain Stimulation, 11(6), 1225–1238.https://www.sciencedirect.com/science/article/abs/pii/S1935861X18302936
- Yap, J. Y. Y., et al. (2020). Critical review of transcutaneous vagus nerve stimulation. Frontiers in Neuroscience, 14, 284.https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2020.00284/full
- Task Force of the European Society of Cardiology. (1996). Heart rate variability. Circulation, 93(5), 1043–1065.https://www.ahajournals.org/doi/full/10.1161/01.CIR.93.5.1043
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