The dentist that work for had a dizzy spell, lost feeling in his right hand. Took him to the ER, check in nurse claimed " what's going on, you are my 6th patient since 9:00 that has had the same symptoms. He's had 3 moderna shots. The hair on my neck stood up.
I'm in Florida, Space Coast area
Maybe similar to all those cases of people suddenly hearing or seeing something over their shoulder, then convulsing.