Why is it that I always get headaches before important events?

Things like tests, speeches, sleep. Yeah, they suck.

And they aren't just headaches. Oh no. They are earth shattering migraines.

Mondays seem to be a headache holiday for me.

And for some lame ass reason, it is nearly immpossible to convince someone that you have a headache.

My dad doesn't understand that I cannot function in school with a migraine. He thinks that they are just like normal headaches with a different name.

I informed him that they are like someone beating you with a baseball bat that is on fire.

Anyone else have this annoying headache curse?