I ended up with a headache at work today.
Not quite surprising since it's a Saturday, which means mostly customer service related tasks.
But still annoying because it was one of those headache that didn't want to go away with simple meds.
It's stuck with me throughout the day, coming and going in and out of notice. 
Hopefully some rest will help it fade.
But really. Who knows at this point.
At least it's just a faint ache right now and not a throbbing thunderstorm of pain.