If it's mentally stimulating? No problem, can do stuff that interests me for hours on end easily.
If it's not? I generally am consistantly fidgeting 100% of the time anyway, tapping feet, humming, playing with pencils, drawing, etc, always have something I'm doing physically at all times. Such is a drawback from having gone through the whole ADHD thing, basically means I need some way to distract myself so I can stay focused... if that makes any sense >.> Basically if I'm not doing at least two things, I can't concentrate on one. Makes no sense, but go figure.
In any case, it means I'm always doing SOMETHING at all times physically. As such, the intense need to 'get up and walk around' isn't nearly as that bad for me as I've since learned to control that over many years of conditioning to cope with a more advanced version of it. Oddly enough, it looks like that's since helped me surpass some of the issues the rest of yeu seem to be facing XD
Funny how things work out that way. I'd say just focus on trying to aim at finding distractions, as it's helped me more than anything else so far.