What to do when your psychiatrist refuses to treat ADHD?

I had to switch doctors recently due to an insurance change, and my new psychiatrist refuses to treat my ADHD without a full ADHD test from a diagnostic center. I currently am unmedicated and don't have any level of executive functioning to deal with that. I've been diagnosed and on Adderall for years, I know how much it helps and how much I suffer without it.

How would you go about this? Would you look for a different doctor? I waited almost two months for this appointment and already lost my job due to untreated ADHD so I can't really afford to wait.