How Can Rectovaginal Fistula With Vaginal Area Infection Be Treated?

Hi, i wounder if you can help i been having problem having sex i have alot of problem in that area with infection, since my son was born 4 years ago they just found out i have rectovaginal fistula , but what my simptoms are now is i am very tried i fall asleep on the sofa and i dont even know i have, my eyes really hurt and no matter how much sleep i get i feel run down and now i am getting upset and shouting all the time. please help.