Suggest Remedies For Vomiting After Taking Medication For Bumps

my boyfriend had bumps all over his body and he went to the hospital and they gave him a shot of benadryl. they then perscribed him benadryl and medrol. he hasnt got them becausde he has no insurance. but he is was fine. but later on today he started throwing up after he ate. what can he do? please help me