I have a vaxxed friend with intermittent severe vertigo lasting several hours or a day each time. She never had it before and was a normally healthy gal. Another vaxxed friend just had a brain bleed. Fortunately it didn't kill him but he's pretty incapacitated. Several other vaxxed friends have had covid. None of my unvaxxed friends or I have been sick or had any unusual problems. So in my micro world, the explanation is pretty clear. Stay away from the vax.