Once my head stops splitting

I have got a SPLITTING headache, and it's been prevalent ALL DAY TODAY! Causes? So many to choose from:

• lack of sleep? For various reasons I won't address, I wake up a few times every night.
• Shawn's alarm clock set for five hours before he eventually wakes up. You know those ERGH ERGH ERGH ERGH ERGH clocks? Yeah. One of those. And I thought my cell phone alarm was bad. Dah dah diddle diddle Dah da diddle diddle. Much better, and I can hold it under the pillow so it's not as loud.
• staring at a computer screen for four hours at work. Maybe getting my own lap top WASN'T such a good idea (yes it was Shawn, thank you so much for buying it for me!!! ILOVEYOU!!!!)
• (I think it's really this one) the smell of my Betty Crocker book, which I pulled out at work and in most of my classes. I've had it out as I've cooked about 20 recipes, ranging from sweets to meats, so you can imagine all the delicious smells it has soaked up. I'm freakishly sensitive to weird smells, so yeah. I'm glad this class is almost over. Two more recipes!!!
• that time of the month *ahem*
• (or this one) my stupid contact prescription. My eyes refuse to focus, and they bother me every few weeks. You know George Michael in Arrested Development when he's getting his eye examination, and he's like "B, no C, is it C? Is A out of the question?" I know how he feels. I swear I make my prescription worse rather than better with those stupid exams.
  
• tension--I sometimes bite down really hard, or kind of lock my jaw when my head is slightly pointed down or I'm focused or thinking hard about something. Or just stressed. That's been known to cause headaches for me too. OH MY LIFE!!!!!
• the homemade fudge and homemade buttermilk biscuit mix I may have eaten for breakfast. WHAT?! YOU DON'T KNOW ME!