I ended up with a headache behind my right eye for most of today. 

I'm pretty sure it was triggered when I got startled awake this morning at like 7:30 am when I received a text message.

As I woke up long enough to glance at it to make sure it wasn't an emergency before rolling over and going back to sleep.

And I'm pretty sure the disturbance to my sleep through off my sleep cycle and I didn't sleep the right amount and that triggered the ache behind my right eye. 

It probably could be not eating properly as I ended up barely grabbing anything to eat before darting off to work. 

And the headache persisted for at least half my shift before I was able to make it go away.

Probably from a combination of a) Tylenol b) Coke c) Heatpack d) quick snack e) quick nap.

As after I took that brief ten minute nap the headache did noticeably decrease and went away entirely sometime after I took my lunch break. So woot.

Glad I was able to make it go away. Especially because I ended up stuck on register more often than not and it's hard to keep up the 'I'm perfectly fine" act in front of customers if you have a headache pounding away behind your eye.