Ended up with a slight headache behind my right eye today.
I think it's tension based.
As it came on towards the end of my shift when I was the most tired and the most stressed in trying to close down the department when everyone and their mom suddenly needed my help. *exhales*

But yah. It's fading now...mostly because I think I distracted myself away from the headache.
But it could have also been eating things and drinking liquids too...