I can understand this can be frustrating and embarassing even.
Please understand that there are many causes for such a presentation. From the list of medications prescribed your doctor has tried everything from antibiotics to anti-fungal drugs.
In such a scenario when response has not been noted I would advise a culture examination of a vaginal swab test along with a pap smear
Sometimes and undiagnosed or uncommon infection can cause this or even something as simple as an imbalance in vaginal pH or dehydration
Please go about the above mentioned investigations and report to your doctor or write back to me with the results. I am sure we can find a solution to your problems.
Hope this helps.