I was diagnosed in 2011 and there are still times when I think that it just can't be true. In the meantime, though, I sought out treatment for DID and I am still in treatment for it.
For me, acceptance comes and goes. At times I feel ashamed that I am mentally ill. At times, I think that I have done well to have gotten this far. At times I am very motivated to get healthy and at times I want to just give up. My ts and pdoc all agree with the diagnosis and I rarely raise my doubts with them anymore. The fact that I am responding to the treatment might be significant.
You may be like me and need therapy to accept your diagnosis. In fact, I am not sure that accepting the diagnosis was even one of my treatment goals. I just want to be able to function without all the interior conflict and time loss and disorientation.
I remind myself sometimes that I was thoroughly tested by an experienced psychologist who had nothing to gain by diagnosing me a certain way. I remind myself that ts and pdoc agree. I remind myself that DID does explain many of my symptoms. I remind myself that in the end, the label doesn't matter. Getting better does.