@stevenj77 First, look for a long COVID specific practices, particularly those with a strong autonomic dysfunction/CFS/MS, etc.. emphasis.

COVID can directly damage the white matter in your brain, in addition to causing gray matter loss. Grey matter volume can be recovered; White cell death is not reversible. COVID acts like an autoimmune disease. It damages the blood-brain barrier, which allows more things to pass through, and simultaneously causes detrimental immune system activity in your brain and CSF.

There's currently a lot of research going on regarding long Covid that's finally shining a light on a lot of other conditions with similar and related symptomatology.

I highly suggest going to an ENT regarding your ears. The fact that it's continuing to be damaged, causing dizziness and tinnitus, after the Covid subsided is concerning. It's like losing your sense of smell afterwards instead of during.

Tinnitus is often caused by inflammation. The pressure damages the related main nerve of your middle ear responsible for your hearing. You can also lose your ability to hear properly or lose certain volumes and tonal frequencies. A hearing test with the ENT is an important thing to have done. They can see where you stand now, and monitor for additional losses. They may have some ideas on how to help. Sometimes losses can be regained. Unfortunately, the Tinnitus is pretty permanent. I suggest a white noise machine at night.

A sleep study also wouldn't hurt. Mayo has the absolute best facilities for that, so potentially having access to that is very fortunate.