Hi,
I'm an infrequent visitor to the site, but thought I would chime in with my own experience with uc and fistulae since there are so few of us.
I started with a large rectal abscess that required surgery and a three day hospitalization. The infection made me really sick. When I came home from the hospital a traveling nurse filled my wound daily with absorbant packing so that the wound could heal, "from the inside out" as they called it.
Despite all those precautions the abscess never healed completely and I was left with the fistula from somewhere in my lower rectum to just outside my anus. It weeped bloody goo all the time and was constantly sore.
I couldn't get rid of it fast enough. As soon as I knew what I had I made an appt with a colorectal surgeon and made a date two weeks later for a fistulotomy which Eva Lou described in an earlier post.
What I have now is a long (thin and fairly deep) crevice running from rectum to anus. And yes, sometimes stuff I would rather stay inside does ooze out on occasion, but it is very small amount. It gets sore sometimes. It did cut through my sphincter and I have minor issues with leakage with urge, but never enough to soil my underwear now that my colitis symptoms are not severe.
I have had two scopes with biopsies that came back as ulcerative colitis.
Also, fwiw, my regular GI admitted right away that he wasn't enough an expert on things like a fistula and that a colorectal surgeon was the doctor to consult for options.
Best of luck! I hope you get this resolved soon.