My advice would be to get a new psychologist. It doesn’t seem that there is enough trust in your relationship for the process to work.
I’ve had a very similar experience. I found myself referred to a neurologist, who latched on to the fact that I’m taking Prozac for maintenance, and declared that my depression is not well controlled. He also implied that because I’m a PhD student and scientist I can’t have ADHD. “People with ADHD go crazy doing that kind of work”, he said. It was only afterwards that I thought to answer, “But trying to do this work is driving me crazy.”
In the end I found my GP more helpful in willingness to prescribe medication.