No one noticed for years (I am a girl and girls often have different symptoms than boys)
I asked my psychiatrist for help with work accommodations due to concentration issues and they wanted me to go to a neuropsychologist (thousands of dollars with insurance)
Switched to a different provider who immediately diagnosed me after a single page questionnaire. Got meds. No drug test required.
Ended up switching to another provider for reasons - they wanted me to get tested again because they didn't like the prior test ($$$).
Got the diagnosis but still couldn't refill the original meds I was on because of other health issues. Went untreated for about a year before receiving clearance from a specialist. Drug tests required monthly ($$$).
Had to switch providers yet again for reasons - they almost made me get tested again but I somehow convinced them not to. Got meds. Drug tests every few months ($$$).