Sorry to hear you are dealing with a fistula. Please make sure you ONLY use a CR surgeon...you really don't want to take chances with that area!
Infortunately my body was too diseased to try the plug or flap surgery so I cannot answer those questions.
I did have Setons to keep mine
open and was on Cipro (allergic to Flagyl) to help. Remicade did close mine but my body didn't like it...and they
opened back up.
Welcome to the forum