I also got C Diff after my VSG. For me, it was 1 week Post Op. I was so relieved to see that others had the same issue and that it was the antibiotics and not a complication from the surgery. I lost 20lbs in 3 weeks while I was sick. Initially I was prescribed Flagyl, it was horrible. It made me so nauseous. I was heaving all the time and my urine was the color of Pepsi! After 5 days my doctor told me to stop taking it since it was making me sick and the diarrhea was gone. It was risky and sure enough, 3 days later I had a relapse. I was then prescribed Vancomycin. It was $1100 for a 10 supply but it was so worth it! Within a few days I was feeling so much better. The worse thing now is that I feel set back with my sleeve progress. Once the diarrhea stopped and I started keeping food down I guess my body wanted to just grab on to it and I have gained back 2lbs in the last 2 weeks. I'm sure things will level out soon. I'm still trying to regain enough energy to finally start exercising. When I was sick it took all my strength to have a shower. One thing that I thought I would mention in case anyone is reading this pre-op is that you might have warning signs even before your surgery. For me, I always develop a yeast infection when I take antibiotics. Had I known I would be given so much antibiotic after my surgery, I would have discussed this with my surgeon before hand. I know they are trying to prevent infection but the antibiotic overkill which caused the c diff was just as dangerous.