I was diagnosed with C Diff at the end of March. The doctor put me on Flagyl. After the course of that medication, I had the same symptoms beginning one week later. Then, I was put on Vancomycin for 10 days. Exactly one week later, the symptoms came back: diarrhea, low grade fever, cramping. I have since had two test for C Diff, both came back negative. Is it possible that the C diff is still there? Or am I dealing with something exactly the same... but different?