I knew it was coming as soon as the muscles between my shoulder blades tensed up.
Unsurprising because work was being it's usual Saturday stressful in that a lot of people were coming in and I'd just spent like the last straight hour helping customers out with the culmination of my last customer before I took a lunch being....a difficult one.
So the tension in my shoulders, going up to my neck, and then settling behind my right eye isn't all that surprising. 

Saturdays are usually the most likely days (besides Fast Sundays) for headaches to rear their heads because gah. There's sooo much customer service and soooo much need and I'm stressing trying to get opening done and making customers happy and my social battery is just draining and tensing me up and yah.....

Headaches aren't fun.
Especially when they're refusing to leave.