I feel for you. I was misdiagnosed by my first psychiatrist. He seemed to be reaching for anything to nail down the cause of my psych issues. I like to have an accurate health record since treatment is based on diagnosis. I changed doctors and now have, what I believe is an accurate diagnosis. Could your psychiatrist just have been plain wrong? They have flaws and failings like anyone else. Diagnosis is based on a number of factors and if they can't tick off enough boxes then accuracy is difficult. It's ok, in a tactful way, to express your feelings about the diagnosis. I don't know about testing. When I was diagnosed it was based on history provided by me. I hope this helps.