I'm new to this site, but felt I had to comment that I recently sold a house to a psychotherapist whom I confided in that my daughter was transsexual. She immediately confided right back that she'd recently had a client who was also ftm and that "she just couldn't relate" to her/him!
I felt SO sorry for that person, and immediately realized that unless a therapist is particularly qualified to work with transsexual people he/she is going to be totally useless. I suspect that they learn in med school that transsexuality is probably a result of impaired mental health. When I discussed the fact that my daughter, who identifies as a male though has not had sexual reassignment surgery, feels that you can fall anywhere on a scale from 1-10 gender-wise, without ever HAVING to be either/or, it gave her cause for pause. She had simply been trained to believe that sexuality is abosolute.