Why Are Headaches So Mean?

I have the most insane headache right now.  I've had it since yesterday and it just won't go away.

I hate it when I get headaches like this because I have to take painkillers, which I don't like doing because they make me really sleepy - 14 hours I slept for last night!  Went to bed at 12am, woke up just before 2pm. I didn't even dream or wake up for a pee and a drink.   So already the day is almost finished and I have completely missed it.

Where do headaches even come from?  Normally I would look into things like this as I love learning, but I just don't have it in me right now.  This is what I hate about headaches - they mess with your brain!!  It worries me when they are this bad.  My brain controls the rest of my body so if it's in pain will the rest of my body suffer?  Maybe not, or maybe it's so small I don't really notice it, things like sleeping for 14 hours!

Anyway I'm sure it's nothing serious, and worrying about it probably isn't helping.  So I will stop thinking about it and maybe it will go away.