Headache and fatigue...daily

For about the past year I've been getting headaches and extreme exhaustion almost daily. It happened more during the school year usually during my last class, right after school, or sometimes in the evening, but it would always last until I went ot bed. It made it hard to do any of my work. The headache was usually on one side and was never really severe, but I always felt tired and unergetic. It's happened a few times this summer...it's happening right now in fact. My brain seems slower when I' get like this too.

I have no idea if it's related, but the past few days I've had a hard time getting to sleep, and I've woken up really tired.