Hi praty,
I'm no CRS, but it sounds like the fistula might be recurring if you are getting a lot of pain and discharge. It's not 100% (it could just be the last bit getting out), but you DEFINITELY need to see your surgeon immediately. Are you otherwise healthy? Do you have any underlying diseases? Most abscesses are caused by a blocked anal gland, but a small number are also caused by Crohn's disease, diabetes and HIV. IF the fistula is recurring AND you are healthy, then its a simple matter of the surgeon re-doing the surgery (fistulotomy works best- the lay-open technique). You should ask your CRS if he/she was able to find the internal opening of the fistula. Often fistulas will recur if the surgeon was unable to locate the internal opening. It might be a deeper/bigger wound second time, but it should eliminate it permanently. I had a big pen wound after mine and it took 14 weeks to heal BUT, my drainage stopped almost immediately after the surgery and I never had any drainage during the healing process. I DID have some pinching pain when it was at the end of the healing process, and this was from the scar tissue stretching near the anus with bowel movements, etc. and was normal.