1 week headache

So here's the story: I was out last week on the lake just seadooing and such, and ever since I got back I got a headache (I usually get them from reading and such in the car, but they tend to go away.) Throughout the week I've noticed that it just doesn't go away, and seems to get worse when I'm at a computer or watching T.V. I've also noticed I seem to have a slight infection (I think?) above my top teeth where I accidentally hit my gums with my toothbrush (it hurt.) I was wondering if the two could have anything related. Thank you for any help you can give, I'm 18 years old as well, if that's any help.