Hello from Australia,
I have found relief using topical amitriptyline (Endep). I have to apply it daily and after about 5 days, the area is relatively pain free. Unfortunately however, if I discontinue, the pain returns after a couple of days. But the relief is still still welcome!
It was prescribed by a gyno specialist as part of a trial. That was about 5 yrs ago, so I'm not sure where the research has progressed to since.