hiya..
first of all, very warm but very gentle ((hugs))
..that sounds like a really awful experience for you
I can't answer whether you have PTSD or DID but it does sound like you've got a lot of confusing and upsetting thoughts and emotions swirling around atm..
For the rest of the night I didn't say anything and was almost in a trance just laying half asleep on the couch.
^^ this bit sounds very much like you closed down emotionally for a little while to let your brain process everything and i'm very glad that you were able to do this with your girlfriend there.. it sounds like she's very caring and you feel comfy with her xx
i won't ask too many questions because i think it's a good idea just to let you have some processing time and sort through all of this in your own space and time..
I think what may be a good idea though - is maybe to think about seeing a counsellor for a little while and have a chat about all of it.. you've got an awful lot of things to think about atm..
xx