Your symptoms sound exactly what I have been experiencing since April 2020. I have gone to cardiologist and went through many test….nothing! Then went to two Neurologist and again they couldn’t find anything physically wrong. Every time they asked if I was anxious and yes I’m anxious about these vibrations. It wasn’t until I read an article on Long Haul Covid that I saw people with identical symptoms. What a relief!! I’ll go anywhere any time to find treatment for these vibrations because I am starting to see problems with my dexterity and balance.