Almost all "research" I've seen of so-called "long COVID" has been self-reported surveys from self-select internet populations; hopefully it's obvious why such "research" will end up dramatically overstating the prevalence. (Edit: Re-reading this the tone doesn't come across quite how I want it so to be clear I'm criticizing the research itself not denying that anyone experiences these symptoms)
Lastly, I do very much worry that the widespread culture of fear and stress - which has been actively encouraged rather than calmed down by health "experts" around the globe - is contributing to a type of psychogenic / psychosomatic illness. To be explicit, psychosomatic illness is a real illness, but it does mean that the underlying mechanism is not of physiological origin but rather psychoemotional stress/belief systems that ultimately culminate in physical symptoms.
Very sorry to hear that you're actively suffering from long COVID. I hope things get better for you. I struggle with a sort of chronic fatigue myself (not anywhere as severe as the ME/CFS type horror stories I hear about, but still) so I know how shitty it can be. I've always got a bunch of ideas bouncing around my head of new research directions, articles I want to write, etc, and it many times feels out of my control whether I'm going to have the energy to pursue those goals or not.