My 18 Year Old Wasn't Feeling Well Today After Taking

My 18 year old wasn't feeling well today after taking nap. As soon as he awoke he came into the kitchen to get a drink then walks to the living room and passes out face down. He
Is body stiffens and his eyes roll. After about a minute he slowly becomes coherent. I took his temp and it was 100.5, gave him Tylenol, an hour later temp was 100.9 and another hour later it was 100.0. He's been resting every since, with me close by, now he's complaining of a hedChe. He's had about 5 of these since he was 5 and we've determined they were associated with being sick, pain(like hitting his shin) or even hearing someone giving graphic details about an injury. The episode before this, which was 2 years ago was because a dr was messing with a planters wart he had on the bottom of his foot.