Hi groundhog. Funny you should bring that up, when I go to doc I am going to ask about fistula, because I have had some strange symptoms as well as the backache. Pus leakage from back passage ( sorry for the graphic info) a few weeks ago thatt local doc said he thought was a fissure, but I don't think it is. I have been feeling lousy and just put backache down to cystocele, but I'm really not sure now, considering I've had hysterectomy, prolapse surgery, ( and I agree with you , I regret them now) and now diverticulitis, a am a good candidate for fistula. Could you tell me how you found out, symptoms etc. ? Thanks so much .