What do you guys think of Amen Clinics content on ADHD? (not a religious organisation)
(www.amenclinics.com)
A therapist recommended him to me. It sounded validating that a simple brain scan could diagnose you with something you suspected you had, but other physicians refused to diagnose. However, his clinic gave off red flags by prioritizing expensive, imaging tech that is in its infancy -- while still offering traditional treatment like medication and therapy.
IIRC, ADHD medication has the best track record for improving symptoms and outcomes in the long term. A standard psychiatrist can work there. Pushing medical imaging (out of pocket) seems like a distraction at best, and a money making scheme at worst.
If it works for you (and your budget), then I'm happy for you.