I am certainly not an expert, but a fellow sufferer like you trying desperately to treat this fistula without having to have another rectal surgery. I've been doing extensive research and have found these recommendations. Do they work? I don't know. They give some relief, but the verdict is still out as to whether they will actually heal this abscess and fistula. Urgent care probiotics, Epsom salt tub soaks 3 times a day, application of diluted oregano oil (burns on application, but only for about 90 seconds) which is supposed to be a natural antibiotic, 1000 mg. of vitamin C daily, eating lots of protein, 1/4 c. raw cabbage juice daily and slippery elm tea. Coconut oil helps with itching and burning. Good luck to you.