I'm 16 and I think i might have some kind of acute ADD. I don't normally have problems concentrating at school, and if its a little past midnight (or past 1:30 or so on a bad day) I can concentrate and be creative without a problem, but the thing is that when I'm get home from school until really late, it takes me hours to do homework assignments that should take me only 30 minutes. I try to avoid this as much as possible, so i have a very unstable sleep schedule during school, and I miss out on a lot of sleep. I'm in mostly high level classes (not to brag, but just for info), and I do great during school, but at home, sitting down to do homework for even an hour(as if!) is horrible torture and I'd rather do ten hours of manual labor after school.
It's draining away my life, and sleeping like this is probibly not that healthy. I know its not because of any nutrition deficiancy (popping vitimins is like entertainment, but they don't seem to have an affect on me). I dont eat much refined Sugar at all. I think I saw something about fruit intake on this site so I'm wondering if that might be importaint to mention.
I eat a lot of fruit all of the time, and everyone assures me that it's completly healthy, but I'm a little worried that all the calories that I get from the peaches, apples, bannanas, grapes, kewis, oranges, etc, is from Sugar and it might be making it hard for me to concentrate. Could this be true? Even if I had that I wouldn't even dream of taking pills because thats a really scary thought, but what can I take out of my diet in order to help me focus better?
Oh yeah, i forgot to mention, when I can work on the computer and solve programing challenges(im not very good like some supernerds, but this is just as a point) without a problem, but even if I go directly from that to say a math work sheet, I feel like my brain wants to explode, as if i could jam a straw into it and make it feel better, lol.

Thanks.

Edit: I forgot to mention, but I don't mind learning stuff on my own online and stuff, in fact i really like it, but homework is driving my brain crazy. I'm not trying to give excuses for being lazy but I really need to do something or else I might look 50 by the time i get out of college(haha), and I want to be able to get out and do stuff, but I'm always either staring at an assignment or worrying about one, I rarely get out (and my grades plummet) :-/. Thanks again.