Welcome to HW...being a woman, I can't totally relate to your problem, but I do sympathize. I have had one fistula in a much simpler place and apparently they just found another in my colonoscopy yesterday.
CMom2 proposed the best question...are you on any meds? With fistulizing CD, meds seem to be the only real long term solution. I had a seton for mine because it was mostly external, but they will keep coming without meds. My GI has said that imuran can help in the healing of fistulas, without going to the remicade/humira. Are you trying any of these?
Dx'd '90 (emergency rupture), symptoms ignored long before that, '03 fistulas and bad flagyl reactions, B12 weekly, Pentasa [until I surrender to the bigger meds]
I'm riding on the escalator of life....