Why do heads pound?

I have been having this incredible headache since the moment i woke up yesterday. Not that it's excruciatingly painful, ( it's more like a dull, relentless kind of pain), but just wouldn't go away! I tried rolling my neck, massaging my feet and toes (they are connected to the head u know?), and nothing works. I think i need a full body massage!

Anyways, it's gotten so terrible that for the best part of the rest of the day, i felt like puking...

So, now at 1am, i finally surrendered,, i just popped 2 painkillers (hey, i just dun believe in medicines unless absolutely necessary, can?). Hopefully, i will be able to get a good nite's sleep later.