my husband had c-diff colitis on and off for the past 3 months, he was given vancomycin for 14 days then after 2 weeks it flare up again. He was given metronidazole for 7 days, but after 2 weeks the diarrhea starts again, what is the treatment for this? Is taken so much antibiotics good for him, it seems it kills the good bacteria. What can you tell me about this.