Hmm seems to be the week for headaches.
Probably holiday shopping stress is the main factor here.

Ended up with a major headache behind my right eye today while in the middle of the last of my Christmas shopping.
Which makes sense as I was foot sore, hadn't eaten or drunk much, and probably was tensing up from the stress of being around people and trying to find the last of the presents. 

I'm guessing that sleep (and probably taking out my contacts) will help get rid of the issue.
As heat and meds haven't really helped do more than take the edge off.