I had the same issue and I am finally cured after 20 years!! I hope I am able to help others like yourself with this issue. I kept thinking it was a vaginal infection or a Uti but most of the time it came back negative! All this time with burning and vaginal pain all were allergic reactions to chemicals and foods!!! Go to an allergist and get a food, environmental, and most importantly a chemical test. My allergies are latex, nickel, & almonds. The products that contained latex is the following- condoms, tampons, maxi pads, bikinis, and underwear!! My shower gel had the almond oil and my shaver contains nickel!! I changed to trojan non latex condoms, natural lubricant, natural tampons, natural maxi pads, latex free underwear. I am in search for latex free bikini and stainless steel shaver. I finally have no more burning and no more pain!!!!