Vagistat-3 and gyn

One year ago I took Vagistat-3 at night and had a terrible reaction. At 2:00am I woke up on fire. My vaginal hole opening was swollen shut, and red intense pain all around my vulvar area. I rinsed it out, and my gyn called in some tx treatment for bacterial infection, then Vandazole, then Lidocaine HCI3%-Hydrocortisne Acetate, antihistimenes, calcium, zinc, Vitamin D, and I still suffer painful vulvar pain to a point of no intercourse for over 6 months. The pain upon entry is unbearable even with lubricants. To insert a tampon would be impossible. If anyone knows where I should go next, please advise. All vaginal test come back negative for yeast or bacterial infections.