LOSING MY MIND. 4 weeks of burning!!!

Just recently had sex for the first and second time. The first time was with a condom, I started experiencing burning shortly after. It seemed to be getting better through the week and I ended up having unprotected sex and the burning never stopped. I've been having vaginal burning (urethra area) and a lot of milky white discharge for over a month now. I've been tested for chlamydia, gonorrhea, trich, uti, yeast infection, and BV; all came back negative. I've never had any outbreak or lesion, I've had two gynecologist exams in one month- both seeing nothing wrong. I have not had sex since then, but it didn't burn DURING intercourse, only after. It burns all the time but more when I pee. It's been about 30+ days and I'm losing my mind at this point. Neither doctors have any idea whats wrong. I was given a round of bactrim (to kill bacteria) and it did not work. I also tried over the counter yeast infection treatment. I'm losing my mind. PLEASE help.