17/male okay so today is Wednesday, ive been having really bad...

17/male okay so today is Wednesday, ive been having really bad headaches for the past two weeks, i don't know why, but on Monday, my eyes started hurting whenever i looked anywhere else but straight ahead, really intense dizziness...Tuesday, the dizziness subsided, id been on dayquil/nyquil since Monday morning and stopped it Tuesday night Wednesday - i stayed out of school all day, doctors diagnosed a sinus infection, and gave me the Zpak... so since Monday, i hadn't crapped....i don't know if it was just what i had been eating, the illness, or what, but right when i took the Zpak's double dose, ive been dealing with stomach cramps and diarrhea. i got some kind of rash on my abdomen as well, im worried to find out what other side effects come on from this drug...