Some quick video material about the belief that ADHD doesn't exist, and is not a treatable condition: https://www.youtube.com/watch?v=V5tLi1bYilA - informative and entertaining.

But don't just take their word for it, have a look at the reference material in the video description.

Another interesting, and emotional, view of the effect of not being on meds from the same artist: https://www.youtube.com/watch?v=rD9qK8-sMGQ