Fellow fistula sufferer here.
I don’t fully understand if you still have pus draining through your rectum. Do you have Crohn’s? Is it with active inflamation?
I don’t know your circumstances but from my experience (FiLac, a collagen plug and two days ago Permacol), I’d try to check/feel the skin above (outside the rectum I mean) where the fistula tract is for a new abscess forming.
This happened after my FiLac but the I drained it and that part of tract eventually healed. It took about
6-8 weeks though.
The pain you described in your rectum is all too familiar. In my case it was present while the surgery site was healing and not really at any other time. I only ever had two stitches tops so the pain went away fairly quickly. It could be that in your case it’s just taking a fair bit longer.
Can you call the surgeon to discuss? My CRS uses Whatsapp and while I still feel like a creepy stalker texting him on it, he’s given me reassurence re post-op complications (or panic) on many occasions.
I have/had a complex RVF but it’s now down to just the main RVF tract which I just had Permacol put in. And now we play the waiting game.
Hope things improve quickly for you.