Does anyone have experience with resistant D. fragilis? I've tried anti- parasite herbs (artemisinen, oregano oil, Black-Walnut , etc), metronidazole (Flagyl), nitazoxinide, tinidazole, iodoquinol, and paramomycin. But I still have all my nasty symptoms! (Abdominal pain, loose stools, weight-loss, flatulence, bloating). My doctor seems to think there must be a Mystery Factor sustaining this infection - otherwise it should have gone away by now. (I've been having symptoms for almost 2 years.) He suggested mold in my fridge as a likely culprit, except that there is no mold in the fridge! (There is some mold/mildew on my windowsills, though. But of course I'm not licking the windows!!)