It sounds like there are three separate issues that you could raise directly with your therapist.
1. feeling overmedicated and all the ins and outs of that. Since both pdoc and tdoc and you seem to agree then maybe you can get the help you need to slowly taper off one or more.
2. her suggestion you switch psychiatrists. It might be helpful to just have a direct conversation with her about that. Maybe also with the pdoc.
3. her questioning your diagnosis. Maybe that is also worth discussing with her... telling her it messes with your head could be a start.