Look up vulvodynia and Pudendal neuralgia.
I'm so sorry about your symptoms.. ive had something similar since June and the doctor just told me it might be psoriasis. Baking soda sitz baths (1-2 inches water and 3-4 tbls baking soda) have helped me tremendously. Make sure that when the doctor tells you you have a yeast infection that he (i'm assuming since he isn't listening) does a met mound or culture. Cytolytic vaginosis is similar to what you described and it is caused by acidity, you can ask your doctor to check your ph next time.