My Dr has me on three antibiotics, macrobid for uti, flagyl for divirticulitis episode and a zpack, now I couldn t understand what the zpack was for, the nurse said it s because of a natural bacteria we have in the vagina, but I have an over growth of that bacteria, it was found when he did my pap smear. What is this bacteria and why would I have an over growth of it and two can I get cdiff from so much antibiotics?