I just saw TEDx talk on ADHD and this came to my mind as well. As for me, I might have been diagnosed as a kid, was on some meds for some time as a kid (without my knowledge), have no formal diagnosis, but I think I very likely have ADHD. The amount of wallets I lost in previous years is suspiciously high. As for meditation, for me, not thinking is definitely impossible (I have no idea if neurotypical people can actually do it), but you can try to repeat some mantra instead (mantra meditation), although that is something I learned about very recently and haven't tried yet.