I don't know about a mucus fistula. I had my rectum and colon removed but still have my anus. I seep mucus all the time and sometimes blood. Not certain if the blood is coming from vagina though. PAP smear was ok. I have to have a transvaginal ultrasound on the 7th of Feb. The surgeon said I had a hematoma or abscess in the anus about a month post surgery and he suctioned that out in the office . Not in any pain. Are you having pain? I do have hemorrhoids and use Tucks and a hemorrhoid cream.
If I were you, I would have my surgeon take another look up there.