When I got so sick a few weeks ago, I had to stop antibiotics, and then I was put on metronidazole for possible c-diff. I don't think I had c-diff, but strangely, I felt the best I have in this year while I was on metronidazole. Muscle, bone, and joint pain gone! Still weak and exhausted, but still, it was great!
When the two week course was over my pain came back with a vengeance within a few days. My LLMD and I both thought that was odd, but she put me ack on it for the next month, along with azithromycin and cefdinir (adding one each week).
I was researching this and cane across a parker by Eva Sapi. It shoes that metronidazole reduces the spirochete form by 50%. I thought it was just for cysts!
www.ncbi.nlm.nih.gov/pmc/articles/PMC3132871/#!po=32.6087.