My 32 yr old son just went to urgent care today for cough, fever. He is on Amoxicillin now but took Ibuprofen at 6pm, he told me "2 tabs"- probably 400mg. Fever tonight at 7pm is 103.5 and I told him to take Tylenol 500mg now at 8pm.. He says he is "profusely sweating" (all day) not just after the Ibuprofen; nausea and taking some fluids, anything else he should be doing? IF the fever does not come down, do I tell him to go to ER?? He is a healthy guy, weighs around 160lbs and has NEVER been this ill - any suggestions?? THANKS!!