I found the dizziness and the palpitations happened even before I started my medicine, I truly think that Covid has affected my neurological system and is then causing rapid heartbeat, dizziness and affecting blood pressure.
My friend had the same thing, following Covid. She had it for about nine months also on a fairly permanent basis, it seems far worse when I first wake up in the morning

My story sounds similar. My vibrations/tremors in my head started 3 month after the booster. I had Covid in July 2022 and my symptoms progressed to tingling in hands and foot. It flared down and I had more energy again to lead a normal life although the head vibrations never completely went away.
I was exposed to Covid a few weeks ago and I am now experiencing a huge flare up, tingling/burning sensations spread to legs, arms and face. Numbing sensations in my foot and face, fatigue (I sleep 12 hours a night), uncoordinated movements and electric shock like sensations here and there. My neurologist is telling me that it's a post covid flare that will take time to get better. But it can flare up anytime even with another infection or the flu.
I am taking amitriptyline which helps me sleep at night as my body needs desperately rest and I was unable to fall asleep without any drugs.

Have you had Covid or do you think it's from the vaccine? Was it the booster that you had two month before vibrations started like me?

Did you do the ANA blood test (autoimmune marker)? I recommend doing that.
I am curious about immunotherapy options for cases like us.