I made an account just to post this as I’ve gone through something similar. Get a formal psychiatric evaluation done out of network by a neurologist who specializes in ADHD. The exam will take a few hours and they will send you a full report and diagnosis. This paperwork will help you a LOT. I’ve used it multiple times when I’ve had difficulties getting care and was well worth the time and money.
I don't even know why they have formal tests. Any health professional and half of the repairmen I've had to my house that has talked to me for more than two hours knows I have it. And probably you too.
Personally I had success with my primary care doctor. But you could also look into online telehealth diagnosis. That was my backup plan to ensure I have access to medical treatment.
