The headache hit hard and fast early this morning at work.
Tense shoulders which caused a fierce ache behind my eye.
Not quite sure what it was all about as I wasn't under anything particularly stressful, but apparently I was stressing because the Tylenol,  Advil, and then Excedrin weren't doing much to help it out. (Meds were taken hours apart) 

Overall though, I think I was stressing about getting what I wanted to get done done.
Because once I actually got to the task that I'd been meaning to do practically my entire shift.
The headache vanished pretty soon after.