An unsolicited suggestion - A specific form of meditation that is incredible active (because that "clear your mind" stuff really never worked) that I really, really enjoyed, and think helped me handle my lesser ADD symptoms.
Pick something moderately significant; your breastbone, a flame, a cup of water. Right? Not totally random, but not like an idol or anything.
Then you alternate focusing really, really into it - very much like tensing a muscle - with expanding your focus as wide as it'll go. Narrow & pointed, oscillate to wide & receptive. Straight up kinda squinting real hard / super-wide eyes helps get you started, but isn't really it.
And... that's it. Just do that for a bunch of reps.
Did two things for me: 1) Usual "workout" / "training" of focus/attention that all meditation does 2) Got to know the 'feel' / 'shape' / ?? of my sense-of-attention.
And, didn't run into "mind does NOT sit still" problem of the "clear your mind" variety. I'm doing something the whole time.
Thoughts? Questions? Comments?