We don't usually double post, and I suspect you will receive a good answer with links from Clyde, however, you will receive replies here that you might not get there. So as not to interfere with Clyde's forum, I will post here.
The definition for DID or DDNos are pretty clear. If your T is thinking you have "unintegrated self states" it may just mean that he suspects DID but hasn't actually spoken to or been notified of an actual "alter" or personality. It might also be that he just doesn't accept the DSM's definitions or even DID at all. You have to discuss this with him to see.
It won't matter what he calls it, as you will still be you, no matter the label. He just needs a label to warrant continued therapy for the insurance company and legal records (as a professional, only.)
Good wishes!
http://www.google.com/search?q=unintegrated+self+states&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US
fficial&client=firefox-a