ADHD isn't too uncommon a diagnosis these days, I'm suprised your doctor won't treat that if there are symptoms.

Have you ever done one of the online ADHD tests? If you took one, scored positively for ADHD, printed it, showed your doctor, explained with examples how the symptoms had affected your life, I find it hard to believe a good doctor would leave you hanging, and if your doctor did, perhaps he isn't a good one, right!

What is on your record? Why would he suspect you of being a drug seeker, but then give you benzos? That's kinda weird.

Either he doesn't believe you have ADHD, or he isn't the best of doctors.

In the past when trying to get pretty strong drugs to help with stuff, I've found good communication is really helpful. That and a good doctor!