My partner makes me talk about my past as well. When we first met, before we started playing, he would just let it pass and hold me until I shook off the panic. But when we set the rules for play, he made that part of them: if I freak during a session, I have to explain why in enough detail that he completely understands.

It's hardand it can hurt a lot to force those words out, but I think it's better that way. There's no way that someone can completely understand what's happened to you unless they've been through something similiar, but if you don't talk to your partner, they can't even make the attempt.

Someone suggested that you write your feelings down since your time with your partner is short, I would suggest you do that with the other stuff as well. That's what I did for my Dom and it actually made it easier for us.

Hope that helps