My DS,17 had his second covid vaccine at the same time I had my booster. Afterwards we were sitting down, he then slumped in his chair, his head fell back. The staff rushed over and pulled him up then his body was moving like he was having a seizure. They payed him down with legs up on a chair. The doctor said he fainted but I said it looked like he'd had a seizure. The doctor said it looked like that because his body was fighting against fainting. Is this possible? I can't find any info about it.