Hi Abby,
I have/had one, found after an MRI scan. I had a two week course of Metronidazole and Augmentin and then i had an ultrasound where they drained any excess fluid from abcess. I havent seen my GI yet to discuss in detail but my ibd nurse emailed to say my recent scan showed no free fluids in the abdomen and he wants to discuss Infliximab with me.
From what ive read this is the best outcome, hopefully it will close up with this treatment. If the fistula penetrates the outer skin, its makes it harder to treat and resection is the only real option.
Im due to see my GI soon so ill keep you posted on what happens with mine.