Thanks for all the responses. I use walgreens and like the doctors in the bay area(overworked and too busy to really help you) I don't think I would trust their opinion. I will do some research online. I seriously feel like I have to be my own medical provider in this world. I need to switch my pharmacy, primary care, and UC specialist. They all have failed me(walgreens asked me if I could wait until tomorrow for my anti-biotics...ummmm...I have been sick for 7 weeks. Call around and find my medicine!!!) Rant over. I am really not that picky of a person. I swear, just can't believe I have been sick for so long with no help.
Your GI doctor sucks if she or he didn't test you for c diff. to begin with. Next time request stool tests from the start. I've had numerous GI docs over the years and all of them do a stool test at the first sign of symptoms. Not suggesting probiotics isn't a big deal. In my opinion, over-the-counter probiotics do nothing. And yeah, it's fun having to be our own medical providers, isn't it? I feel the same way most the time.
OP: How are you doing? Any improvement? The prednisone would only "slow down your diarrhea" if this was a UC flare. It won't help c diff. and could make it harder to treat since it lowers your immune system. Not quite sure why your doctor prescribed that. Are you really taking both Flagyl and Vanco.?