GP/PCP's generally do not like to prescribe psych meds, but there are exceptions. They would likely decline if they know you already have a pdoc. And I doubt a PCP would be comfortable prescribing an obscure psych med.

I'm sorry you're doubting your relationship with your pdoc right now because of the paperwork for the insurance company. Maybe he is backed up, and is just focused on meeting the deadline?
I understand that it's hard not to take things like this personally, especially since you had such a good result with this med

I'm praying that everything works out for you Bobby