It sounds like Vulvodinia! I had terrible burning too in 2008 and I was sent to a neurologist who discovered the problem.I used Gabapentin and amytriptyline for years and high doses,I now only take 1 gabapentin and 1 amytriptyline once a day and I haven’t had any pain for years.It took quiet a while to discover the problem.I remember that I could only wear baggy pants,skirts,and dresses.Good Luck!