I know there are pelvic pain specialists that look at this issue. There is a Dr. Weiss in San Francisco that does this. There are PTs with training in this issue. I read one post about a woman eliminating her symptoms with PT work. I read one woman using and osteopath and other methods. I read one that had a special surgery to pull an entrapped pudendal nerve out of some muscle fibers. I imagine this is not a common IC scenario but I don't know. I know tailbone pain and VD are often present when PNE or nerve root irritation is suspected.