I was diagnosed about two weeks ago and am on Metronidazole. October 2, | stardance2.info "I was diagnosed about two weeks ago and am on Metronidazole. I began this journey because I originally thought my Does anyone else get abdominal pain that feels super similar to menstrual cramps?" Comment Helpful. I do have painful sex, but my period cramps don't seem November 5, | stardance2.info "I think I'll also mention my 17 day course of flagyl, since its know to cause cysitis.