I don't even know for 100% sure I have it but the last time I tried to talk to a professional they basically just wrote me off because my grades were good as a kid, I understand part of the diagnostic criteria is symptoms presenting themselves in childhood but to be honest I got by just fine without studying or paying very much attention.
Does anyone have experience with this
It's a huge pain now. Go see your family doctor and ask for a specialist. However, the specialists are reluctant to give the good stuff because the DEA will investigate any doctor who prescribe over a certain amount of scheduled drugs per year. Then they'll make you jump through hoops like getting a heart's rhythm study done where you have to wear a little box for several days. Also, I hope you live somewhere where the specialists aren't completely full, I've been on a waitlist for the past 6 months.