A little background on the whole past life regression deal. This is just from my memory but I think in the 50's a woman was having extreme headaches. She had tried all kinds of doctors and they couldn't find any physical reason for it. She was reffered to a psychologist/hypnotherapist. At the time regression therapy was around and and this was one of the angles he used. After quite a few sessions and frustrations he point blank asked the lady what the exact cause of the headaches were. She told him that she had been shot in the head and killed. He then started questioning her about it and in her previous incarnation that had been caught stealing and was shot in the head. After that with some follow up sessions, she didn't have the crippling headaches any more. Anyway jsut a little background of how past life regression got started. Psychosematic malady? Most certainly. Caused by something that happened in a past life? Possibly. Does it really matter as long as the lady didn't suffer form the psychosematic pain afterward? Yes, she was indeed cured.
When it comes to GID I don't think it would help. The reason being is if I am dysphoric about my gender and I experience through hypnosis an incarnation in which I was comfortable with my body matching my Psyche then I would be convinced that I could be the proper physical gender in the next life. This may lead to a worstening of the dysphoria and effect the present incarnation in profound ways.
I do not advocate past life regressions. The key point being is whether or not reincarnation is a real possiblity, to the person that experinces them they are extrememly real. Also PLR will allow a person to see who they were in a past life and we know how people are. What if a person in a past life murdered someone but was and extremely caring and sensitive person in the present incarnation? Could they live with the guilt? Would they change this life because of wht they experinced in another? These are all valid concerns in my opinion.
With that said. If a person has a malady and experiencing physical pain that is suspected to be psychosematic with no physical causes, past life regression is a good tool in order to help the person. In my opinion it should only be used by experienced clinical Psychologist. It doesn't matter if it's real or not as long as it helps the person. When it comes to dysphoria of any kind, it is psychological. GID can be worked through and steps taken to physically fix it through HRT, SRS or just finding a "comfort zone".
In the Thibetan Book of the Dead it speaks of us having to drink from The River of Forgetfulness before we are born. Why? It may be because if we remember what we have done in past lives it will have a profound effect in the decisions we make in our current lives. We would be guilt ridden for past misdeeds. Comitting the "S" word just in order to get "do overs" and many other things that hamper us from living from the heart, knowing the difference between right and wrong and many other things. Of course I can't confirm what the Thbetan Book of the Dead actually says but just what I have read about it. I think we're jsut not supposed to know without the element of doubt involved. This is reincarnation or any other belief systems. It supposed to be about Faith or some other variation of such.
Anyway just a little background about how past life regression was found out, how it can help some supposedly incurable afflictions, why I don't think it would be good for GID and a somewhat ancient religious reason as to why we can't rememeber previous incarnations.
And again @ Jay, me too and I sure don't want to go through it again.