Hi Mjw, I'm sorry you are feeling so crummy again. My doc told me that the Zpack was one of the stronger antibiotics out there, so if your doc put you on Augmentin and you have a sinus problem again, I'd definitely call them and have it checked out. Whatever this strain that is going around seems to be pretty powerful; most of the folks in my office had it, and then it was back again in two weeks. Hope you and your doc can get this figured out so you are feeling well again soon.