I developed several autoimmune conditions from Covid/vaccine. It started with antiphospholipid syndrome (clotting disorder). I developed the lupus anticoagulant antibody and had an event in October 2021 (acute DVT in right thigh and saddlebag PE). I had Covid in Jan 2021 and then was vaccinated April/May 2021 with Moderna. Extensive bloodwork and genetic testing found that my APS developed due to either Covid or the vaccine, they can't single out which, but derived from infection and not genetics. I am still on blood thinners due to the APS. In late 2022 I started experiencing intense/debilitating muscle/joint pain, brain fog, tingling sensations, etc. and was diagnosed in May 2023 with Sjogren's syndrome. Again, linked back to Covid/vaccine. I am now on a prescriptions that have immensely helped give me a sense of normalcy, but I went from great health to a complete shift in 2021.
All this to say that it may be worth exploring autoimmune conditions (antibody tests) through a rheumatologist to make sure your long Covid symptoms aren't something more. I had to advocate for myself in getting a Sjogren's diagnosis because none of my doctors were connecting the dots, but I knew my pain was extreme and spoke to something more going on. I pushed for blood tests and found a rheumatologist through recommendation from my hematologist. I never tested positive for ANA, but my inflammation tests were off the charts before I saw my rheumatologist and got a diagnosis.
I have not gotten any Covid vaccines/boosters since because I know my body is susceptible to creating antibodies that later turn, and frankly I am still unraveling new diagnoses since and wouldn't like to take any chances with developing more.