Have you posted to the Crohn's site? There have been many posts on fistulas.
My pelvic floor fistulas, rectovaginal, and perianal fistulas have not returned since I've had my ostomy. After many, many years of remission, I have had one abdominal fistula and a couple fistulas around my stoma that are much easier to deal with.
25+years diagnosed with CD.
Numerous surgeries, permanent ostomy, adverse reactions to Remicade, still on Prednisone (my worst enemy), Surgery scheduled for early July.