Welcome to this site. I hope that you will find it to be helpful.
One of my diagnoses is chronic PTSD. I was diagnosed with it 3 1/2 years ago. It is absolutely terrible and has prevented me from moving along with my recovery. I could go into detail with my experience with it, but I will spare you that. The only rest that I get from it is to avoid it at this point. Although several years of therapy has made it a little bit better.
As far as the touch goes, it's like all of us here share the same soul. So many of us have problems with being touched. I know the feeling well, where you space out temporarily when you know the touch is coming. The only thing that has helped is therapy... reliving those overwhelming experiences.
I think that I became a bit more desensitized when, through therapy, I began to realize, and, especially, feel, that I am a member of this world. I share this planet with everyone else here and that I have the right to be me. This made me feel like not everyone who touches me is going to have access to my soul and not hurt me. It gave me some self-confidence that I have never had, which made it all right to shake hands with another man. I'm still not really good at it, but I'm a little better.
I hope some of this makes sense and helps. It's all about feelings and who can adequately describe a feeling?
John, The Music Man.