I got Omicron in January '22 despite being double vaxx'd, and I felt totally fine until 3-4 mo. later when I started to get recurrent dizzy spells, major fatigue, and bouts of anxiety, which are all very unusual for me. Checkup / bloodwork showed nothing. I am 41 y.o. who exercise regularly, does not smoke, rarely drinks, etc.
So far I can still function and maintain a job, but it makes me wonder what's going on inside of me that 11 months later it's still causing these issues regularly. Our 4 y.o. son got it as well and although he was asymptomatic I am still very concerned about what the long-term effects on him may be.
I am not a doctor and this is not medical advice, but I read a paper saying that hyperbaric oxygen therapy helped some people, so I've been using Wim Hoff breathing as a poor man's version. It does seems to help with the fatigue but not the vertigo. Best of luck.
Wim Hoff Breathing: https://www.youtube.com/watch?v=tybOi4hjZFQ