I am so sorry this happened to you. Seems to me there was an "era" when T's were overzealous with DID. In general, as with my experiences in therapy, I feel the Ts tend to "go by the book", rather than look at each person as an individual with clusters of symptoms to try understanding what their client is experiencing.

A person was abused as a child, they dissociate, they forget important things, or even forget most of their childhood, gosh, then then must be "DID". I had a T tell me that I would never get better unless I accepted I was DID. I really liked her too. She was educated and trained in dissociating and DID. She knew what she was doing. Just in my opinion, not every thing that walks like a duck, is a duck.
Heck, a chicken could be too fat and waddle like a duck.

ANYway, she tells me to prove it, go home and put out some paper and pens and ask those people inside to come on out... SOOOOOO I do that.. But I added, hey if any one in there likes to cook, come on out and sign your name. Or someone that can clean house and laundry, please sign your name... ANd by the way, would be nice if there would be a super smart person that can earn some "big dollars" because this working for nickels and dimes is the pits... And while all you kind folks are doing your thing, I can be doing mine too... shrugs shoulders... T was upset with me an said that isn't how you do it.... Bottom line, I knew something was wrong with me big time, but I was not buying the DID thing.. I ran from therapy and never looked back.. (just adding, not one person signed that paper) so I was right and the T was wrong...

I only mentioned this because it does and has happened to others. I don't know why and I feel bad that you spent l2 years working on a wrong diagnosis.. The good thing is, you now have a correct diagnosis and you can now get proper treatment for healing and your wellbeing.....Good luck... and sending positive vibes.