You finally have a good hour. The fog lifts a little, your legs feel more like your own, and you use it, catching up on laundry, answering the backlog of emails, taking the dog for a real walk instead of a short one around the block. It feels like progress. Then the next day, or the day after, you are back in bed, wiped out in a way that rest does not seem to touch, wondering what you did wrong.
If that pattern sounds familiar, you are not alone, and you did not do anything wrong. What you ran into has a name: post-exertional symptom worsening, sometimes called the boom and bust cycle. It is one of the most common and least talked about parts of long COVID recovery, and understanding it can change how you plan your days.
What the Boom and Bust Cycle Looks Like
It usually starts with a stretch of feeling better than usual, energy that seems to have genuinely returned. That better stretch invites more activity, physically, mentally, or both, often without any warning sign that a line is being crossed. The crash that follows does not always show up right away. It can hit hours later or the next morning, and it tends to be disproportionate to whatever you actually did. A short walk or a busy afternoon of meetings can be followed by days of fatigue, brain fog, and body aches that feel more like the illness itself than ordinary tiredness. Then, once you recover enough to feel semi-normal again, the good stretch tempts you into pushing again, and the cycle repeats.
Why Your Body Reacts This Way
A nervous system recovering from a viral illness is often running with very little reserve capacity, even when a person looks and feels mostly fine on a given day. Think of your nervous system as having a gas pedal and a brake. The gas pedal handles alertness, activity, and stress response. The brake, run largely through the vagus nerve, is what lets the body downshift into rest and recovery. When that brake is not working at full strength, which is common after a viral illness affects the autonomic nervous system, activity is not followed by a normal, proportionate recovery period. Instead it can trigger an outsized stress response that takes days to settle rather than hours. That is very different from ordinary deconditioning, where gradually building back activity tends to help. Pushing through fatigue when the underlying issue is autonomic, not muscular, often sets recovery back instead of moving it forward.
Why This Gets Missed So Often
It is an easy pattern to miss because the connection between an activity and its crash is not immediate. By the time the crash arrives, it is tempting to blame something else entirely, a poor night of sleep, stress, or simply having a bad day, rather than the walk or the busy afternoon two days earlier. Well meaning advice to just get moving or push through the fatigue can make sense for ordinary tiredness, but it tends to backfire for a nervous system still recalibrating after a viral illness, because more activity is not what that nervous system needs most right now. What it needs is support finding its way back to a steadier baseline.
Our Approach at Van Every
We begin with a full history and INSiGHT scans, including heart rate variability testing, so we are working from a measurable picture of your autonomic nervous system rather than guessing from whichever symptoms stand out that day. Using Koren Specific Technique (KST) and Talsky Tonal Chiropractic (TTC), our doctors use gentle, nervous system-focused contacts, no cracking, twisting, or forceful movement, and we pace everything to your current capacity rather than pushing past it. Long COVID patients are often quite sensitive, so early visits stay conservative, and we adjust intensity based on how your body responds. We coordinate with your medical team throughout.
What Patients Often Notice
As autonomic regulation improves, a lot of patients notice their crashes become less severe and less frequent before their baseline energy fully returns, which is often the first real sign that something is shifting. Many describe a wider window of activity they can tolerate before symptoms spike, and a shorter recovery time when a crash does happen. Sleep often deepens, and mental clarity tends to show up in small windows that gradually widen rather than all at once. We track changes with follow-up HRV scans so progress stays visible even during weeks that do not feel obvious day to day.
Practical Pacing Strategies That Help
A few habits tend to make the boom and bust cycle easier to manage while your nervous system recovers:
- Plan activity in advance rather than reacting to a good hour, since good hours are the ones most likely to lead to overdoing it
- Break tasks into smaller chunks with real rest in between, rather than one long push
- Keep a simple log of activity and symptoms so the delayed connection between the two becomes easier to see
- Treat mental and social exertion, like a long phone call or a stressful conversation, as real activity too, not just physical tasks
- Stop an activity at a moderate point rather than waiting until you feel like you have to
If This Pattern Sounds Familiar
If you keep hitting this cycle of a good stretch followed by a hard crash, our long COVID and post-viral recovery page covers more of how we approach care, and our free guide on the autonomic nervous system and long COVID goes deeper into the research behind it. You can book online or call our office at (248) 616-0900 whenever you are ready to talk.
