I can't speak to your diagnosis; however, I can speak to mine. We share some similarities, and my experience, since being diagnosed with ADHD as an adult, is that far from being a chemical straightjacket or restricting my cognitive abilities, taking amphetamines in low doses actually enhances my productivity and allows me to better focus on the things that I don't find really exciting. It allows me to function similarly to "normal" people when doing things that I don't find motivating.
It's a what if situation, I think. If you were Ritalinized as a youth, it has a different effect than on adults, and the brain is still developing. Might have changed you - and not in a good way. That said, it looks like you found your fix, so that's a really good thing.
Personally, I think that ADHD is less of an illness and more of a quirk, but it's a quirk that makes succeeding in modern society quite difficult. Society is built for the majority, for the normal, and that inevitably leaves some people behind. Untreated, I was much less successful, although I could still manage to get by in life. Drugs help to level the playing field a little in my case.
I wish my parents had listened to the advice of professionals when I was a child - I would have probably completed my education along with my peers, rather than having to go back and do so later in life.
I agree it is a quirk. We are too quick to name things illnesses. And yes, society is built for the normies.
In my own case, I ended up not caring a whole lot about society's mores. That's a complicated issue between my upbringing, family, and discovering my capabilities. Now, despite my mental oddness, I can fit right in with my peers socially. I don't talk near as much as they do - and kryste, so many talk a lot - to excess IMO. Of course, they are happy to have a listener.
Anyhow, looks like you found the fix for your quirk. My own fix is getting away from everyone at least one day a week. It allows my batteries to recharge while letting my mind work issues that I kept getting interrupted on while dealing with people. I hop in the Jeep, and drive until I'm ready to come back.
That sounds like introversion, but it isn't.