It certainly possible that it’s long Covid.

I’ve had ME/CFS for 8 years now, bedridden for the past 6 years. The researchers say that long Covid and ME/CFS are sister diseases and that many with long Covid will go on to develop ME/CFS. Unfortunately, however, these illnesses are diagnoses of exclusion.

Perhaps you can see a neurologist specializing in autoimmune neuro, a relatively new field.

A lot of the doctors aren’t really up-to-date on the latest research, and some consider “post-viral” illness to be a nebulous diagnosis.

If you can have a doctor run blood tests to check your MMP-9 and C4a levels, then that might be helpful and perhaps shed some light.