All the Stress

I ended up with one of those nuclear headaches today.
It started right before work.
And refused to leave.

Why did it start?
No idea.
Was it just leftover stress from dealing with all the customers yesterday for Black Friday?
Was it staying up late writing?
Was it stress from finally beginning to post a little fic I've been working on and the consequential worry from how it will be received by the readers?
Was it from eating two croissants for breakfast today when I haven't had them in a couple of months?

Who knows.
I really don't.
Maybe it's a combination of everything above.
But in either case.
It's wiped me out.
It's left me feeling awful.
And I just want it to go away.