I had a fistula lay
open op also, it will hurt for some time, but as long as there is no discharge or blood I think you are ok, in any case call your doc with any issues or q you have, doc is the only person who can tell if it;s infected or not. I wish you best luck with this, I know how much pain and discomfort it is to have it lay
open, it will feel better with time, do not expect it to heal fast as a cut in the arm or leg, it will take longer.