I was diagnosed with ADD in middle school but probably not as severe as the OP.
--I've always been really easily distracted. I got lost in thought in elementary school and should probably spend less time browsing GAF today.
--I had a really hard time paying attention in elementary school.
--As a kid I think I had insomnia and had trouble waking up for school.
--It's impossible for me to sit down while eating alone... unless I'm also watching TV.
--I frequently do things just for the purpose of being able to move around.
After getting diagnosed I was prescribed Ritalin which was very effective in helping me concentrate. My grades went way up and stayed respectable throughout high school. My parents decided to take me off the prescription right before college though for fear of me becoming dependent on it in adulthood. Staying on it for so many years probably taught me intrinsically how to better concentrate and I haven't had trouble paying attention since, but I still get really easily distracted.
One thing about Ritalin though, it will murder your appetite. One reason I got off it is because I lost too much weight in my teens. Through most of high school I weighed around 110lb/50kg (I'm 5'4"/162cm).
Another affect of ADD/ADHD I don't see talked about much is Delayed Sleep Cycle. I'm just now learning what it is. I may have had it as a kid and almost certainly have it now. People have linked insomnia and basically not being a morning person to ADD/ADHD, but now say it all might be because the condition puts some people on a kind of permanent jet lag. Basically, right now my "natural" sleep cycle is between 4 am and noon. I've tried almost everything short of medication to fight it but it just resets to that no matter what I do. When I do manage to get up most mornings I never feel fully alert until noon. Some say the issue is ADD/ADHD sufferers have a total sleep cycle that's around 25 hours, which causes a gradual shift. I probably should have started drinking coffee in high school. They say most people feel alert in the late morning and tired in the early afternoon, but I feel the opposite. Even in school I probably did a lot of my best work really late at night.
The thing is though, I have no problem waking up early if I actually have something that must be done during the day. My sleep issues didn't really start until I became unemployed. I have a feeling when I do find a job I won't have much trouble getting up on time. I just won't be 100% during mornings.