I ended up with a headache after work today.
I think because I tensed myself out trying to get a chapter posted for the story I'm working on as I needed to do a bit of editing/tweaking before I posted it and I think the stress of getting that done and uploaded before I needed to go help a friend move caused the headache to come throb behind my right eye. XP 
It stuck around for the rest of the evening unfortunately. It would fade in and out...but over all it stuck around, I think because the muscles in my neck were so tense.