I don't have any answers for you, but I'm glad you asked the questions, because while I've heard (and experienced) of girl bit pain from saddle position, I haven't heard or experienced anything quite like what you describe. I hope bike fit clears it up for you. It sounds a bit scary! Maybe a visit to a doctor wouldn't go amiss, although doctors don't know all the answers so don't expect too much. Still it's worth a try.