Hi PantherBear, Welcome.
We're not doctors here—this is a peer support group.
Chances are your headaches are probably something benign like a virus, or even hormonal. When people talk about hormonal headaches, we usually think of women and their cycles, but men can get them too, especially during adolescence. They can also be caused by poor diet, poor sleep (adolescents need more sleep than other times of life), stress, and other factors.
I agree it's probably nothing to freak out and make a big deal about, but since it's been going on for more than a week, I think it'd be prudent to run it by your family doctor—even if just to put your mind at ease.
Doc