about four months ago i tested negative for Std/herpes. fast forward three weeks ago, urinating, walking, even inserting a tampon burned like heck. i got retested, negative again. doctors have no answers. cortizone 1% cleared up for some time but no longer is working. i have not had any intercourse due tk the nature of the burning. would anyone have an idea of what this could be and any remedies that could possibly clear it up. im in deserpate need and want to get back to normal life.