I'm sorry that I can't offer a solution, but your situation sounds EXACTLY like mine. I have the same problem, and there is a big tear right outside my vagina (sorry to be gross), and it's painful to wipe, pee, etc. I also had sex without enough lubrication, and I also was tested for herpes, chlamydia, gonorrhea, etc. And I, too, have a thin white discharge. I'm so freaked out about it because I have no idea what it is, and my doctor doesn't either. I'm going to go try and see another one soon, but if you find out the problem, let me know!