Why anybody would fake DID is beyond me. Given the fact that you were then affected by the professionals diagnosis is outrageous. You were both misdiagnosed. The professional people obviously lacked training.

I am very sorry you had to go through that. You need to concentrate on you now. You have enough energy for you. Maybe you can write a letter to whoever you need to expressing your anger, let it all out, then burn it. Or maybe it would be okay for your T to see it.

There is a force in anger. Use it to help you, let it out. Don't let it fester.