I think it’s covid related. I had Covid in March. The upside is you now have antibodies and like me you probably lost weight. (Now back on again with avengence). The test i had in May showed high % of antibodies which was reassuring but I wanted to know how it would wear off so had another test in November (I paid privately) to see what level it had fallen to; it was much lower but I still had antibodies but they will fade.
I imagine by now I’ll be back to square one but apparently your body has T cells that remember Covid so if we do get it again it won’t be as severe at first time. (I hope).
It has left me with shortness of breath and fatigue, Im now anxious and worried which I wasn’t before, , it doesn’t help being cooped up at home either. My husband is no help he is a bit of an Ostrich. You should find a couple of sympathetic friends to speak to, have nice food to eat and find a hobby I’ve started painting by numbers which is therapeutic. Good luck.