Flagyl has been known to help shrink fistulae. So I am wondering if it was doing that for you. The remo is better at it than flagyl, but it will take time to start working.
Drainage through setons is quite normal. Setons are designed to allow drainage -- better than the stuff getting trapped and causing an abscess (OUCH!!). So the fact that it is draining is very good! I suggest you see your doctor is the drainage changes for the worse in some way -- bloody, really smelly, or heavy.
Diagnosed with Crohn's in early 2007. Several peri-rectal abscesses and two fistulae with setons. Allergic to Remicade and Humira. Currently on 6MP, and vitamins D and B-12.