I saw a doctor, got a pill and it's night and day. I feel it, my parents see it and every friend of mine sees it.
Congratulations. I know how you feel.
As for the chicken/egg thing. There's a strong genetic link to ADD/ADHD. You may inherit it, but it doesn't always express itself. The books Driven From Distraction/Delivered from Distraction will make you laugh/cry when you read them because you will see yourself in much of the book as he chronicles many of his patients.
Thanks for your real life story. It puts the lie to alot of the BS on this thread. It's amazing the "experts" that show up when this type of subject comes up. Having dealt with this in my own life and in the life of my first child, its a frustrating thing to see it reduced to "mommy and daddy didn't give you enough discipline" or don't eat this or that.