Hi, I had gone through your question and understand your concerns.
It may be
rectovaginal fistula.
A fistula that has formed in the wall of the vagina is called a vaginal fistula.
A vaginal fistula that opens into the rectum is called a rectovaginal fistula.
causes a vaginal fistula:
Surgery of the back wall of the vagina, the perineum, anus, or rectum. Open hysterectomy is linked to most vesicovaginal tract fistulas.
Radiation treatment for pelvic cancer.
A period of
inflammatory bowel disease (including Crohn's disease and
ulcerative colitis) or
diverticulitis.
A deep tear in the perineum or an infected episiotomy after childbirth.
If you have a rectovaginal, colovaginal, or enterovaginal fistula, you most likely have foul-smelling discharge or gas coming from your vagina.
After fistula repair surgery, be sure to follow your doctor's instructions. See your doctor right away if you have signs of infection, such as a fever, tenderness, swelling, or redness.