I was diagnosed with an upper respitory infection last Saturday after a week of cold symptoms. The Amoxicillin started giving me diarrhea (I think). Then this Tuesday I started running a fever between 100 and 102. Temp drops with Tylenol.. went back to doctor wed and he put me on new antiobiotic. I still have diarrhea, no more cold symptoms and a temp of 102.1. I am a teacher and need to get back to school. I do have Crohn's disease.