PepperAnne, I can relate to what you are writing. I haven't got a formal DID but I function "in someways like a multiple" according to my T.
I read some books from the sidran foundation which helped me understand in the early days of finding out I was dissociative, one in particular "MPD from the inside out" I found pretty useful, still dip into it sometimes now.
For me the complexity of dissociation is not too well represented in the descriptions of the various diagnoses along the spectrum. Reading about it, you could be forgiven for thinking it was quite a tidy thing, popping in and out of altered stated and forgetting things.. but as I've progressed into my therapy I have seen the multitude of subtle, complex and shifting sides of dissociation; from the loss of huge parts of my memory, to horrible frightening body and dissociated memories and nightmares, to the subtle white noise and headache blocks and confusion of the more minor parts( or, the as yet unexplored parts) Having parts of your life suddenly tumble into who you are, feeling that they are from another life, still you, but aged, different, odd. Having so many parts of you clamoring that you can't make a decision, or you can think too opposite things at the same time. Feeling so empty inside like there is nothing to you, that you could shatter any moment.
I think sometimes in the beginning people try to get a conscious handle on it all, I know I did, but I couldn't really see how it operated in me. Then I got my first experience of co-consciousness which was actually pretty frightening and beyond ordinary description. And I realized it was a whole world that is so uniquely personal yet contained such a generality. A way people survive, a general thing the brain does to survive.
I'm not sure I'm making much sense or answering your questions, but I just wanted to say, only by working through your own trauma does dissociation, or at least, your own brand of it, really start to make sense. It soon becomes crystal clear. Good luck!