So yeah, near the end of middle school I was diagnosed with ADHD because of my inability to focus in school and my hyperactivity. I remember how I was, it was bad and I to this day don't disagree with my doctors diagnosis.
I was given a lesser form of the usual medication and it helped. I could focus in school and actually hold meaningful conversations withought needing to jump around like a psycho. At some point we stopped refilling my prescription, but those symptoms never came back. This was about two years later.
So either two things happened: I either my medication "altered my brain", or I grew out of it which is impossible according to a 14 year old's webMD links. Either way, my ADHD has been managed.