Tara,
I have spoken with many mental health professionals over the years and had a few hospital stays. No one really understands DID. I truly feel that they (docs and Ts) are struggling just as much as we are to understand it.
I had quite a struggle before I found someone who was willing to consider DID and refer me to a psychologist. In just two visits he diagnosed DID.
Hang in there. I’m sure your T is trying to understand it as much as you are. Get to know yourself, your whole-self. Learn to trust your own instincts and intuition and know that something in you knows what is going on and why. Talk to your T honestly and don’t be afraid to ask questions. Maybe together you can work it out.