Good morning,
I remember when u announced your misdiagnosis. Your T has a vested interest in the DX. Perhaps it's his ego. Or, I don't know how insurance companies deal with a misdiagnosis of 12 years. If you have paid out of pocket, how do you feel about the money you have spent?
Whatever the case, I would not work with your old therapist. I don't think you will get appropriate care. You need someone who can help you manage your current symptoms and then revisit the DID dx. I am sure you have some feelings concerning your therapy for the last 12 years.
Best regards,
Sabra