I took vancomycin(sp) after being dignosed with c-diff. I know heard it is a powerful drug. i took it for almost 8 weeks. Ive been off for 16 weeks, but my bowel movements look strange. I dont have D but bm are in several pieces (sorry for details), about the size of a tumb and than smaller pieces at the end of the bm. I was drinking kefir but believe that made my stools loose. I have gas in the early morning when in the bed/no pain. I dont know what to do. should i eat plain yogurt? I took probiotics gave me gas all day and very loose bowels.