I have cervicitis & uti, and am on the 2nd day of antibiotics. I feel very bloated and some pain in the upper area of my uterus. Should I be worried?

Probably the SE. Probably the side effect of the antibiotics. Zithromax is hard on the stomach and may cause bloating. Doxy and augmentum can cause GI side effects as well. Go see you doc if they persist.