I was diagnosed with ADHD at a young age and they tried Rittlen (SP Forgive) and my father said it sped me up, Coffee/C affine actually helps calm my mind which the Doctors said happens with some, weird I know, it's kinda like the little squirrel in the movie "Over the Hedge".
ADHD doesn't mean you have issues concentrating, it means you have problems concentrating on individual things one at a time which is why we are horrible day dreamers and terrible at completing single task in a timely manner, we bounce from thing to thing a lot, the new term for it is Squirrel!, I get that a lot, "oh, you squirreled".... So for me written todo list, mental discipline and self control are deadly important, I have worked my entire life getting this down and I am still working on it. I my professional life I am a problem solver/designer and there is nothing better than a project with a lot of moving parts because that is the level my brain works at, High stress with lots going on (retirement is going to be a challenge). In my personal world I always have 4 or 5 things going an I take a bit more time than most but I work it all out, I'll usually stop and think things through on one thing while working on another....
Other issues I have is I am nocturnal and I live on 4 to 5 hours of sleep a day...
Sorry, TMI, didn't mean to ramble, "Squirrel".....