Suggest Treatment For Thick Vaginal Discharge And Pelvic Pain

I am 35, have three kids (ages 8, 6, 2) I have long periods (can last all month) I have endometriosis, pelvic pain/lower abdominal pain and am now experiencing thick gray discharge (size of my hand) for the past four days. Am currently in between periods. i weigh 105lbs, work out and am vegetarian.