I am going to add to this... Rive, this is a very consistent pattern of denial and wanting to deny it with you. What is it that bothers you so much about even the THOUGHT that it is valid and legitimate?! You've had several of us say "it sounds like it's DID", you've had a doctor (at least one) tell you it is. Yet you KEEP insisting on saying things like "could it possibly be this... or that... or can my mind make it all up..."
MAYBE, just MAYBE, you could look at it from another view- WHY would it?! What is wrong with it if it's NOT made up, not wrong, and we and the doctor KNOW we're talking about? Why does this seem to scare you so badly that you cling to any notion you hope can dismiss it?!
Honestly, DID is difficult, it's scary, it's very hard sometimes... but it's NOT as bad as people make it out to be day to day most of the time. It's NOT the end of the world. It's NOT saying you're crazy or anything negative about you at all.
It IS saying you've been through something your mind couldn't cope with at a vulnerable time in your life. It IS saying you are a SURVIVOR- you're stronger than you know... yes, as a "team" or system, but that's part of the whole of who you are. You are stronger than you know. Don't be scared of that.
There's a lot of benefit to being this way, too. You can cope with and handle things you couldn't even imagine having to endure. Is it ideal? No. Is it the "common experience" of most people? Of course not. But it's NOT something to be scared of being if you are either.