Had a faint headache throughout most of work today.
Don't know why my muscles were tense and stressing. 
It was probably just the normal stress in trying to get the department open and dealing with all the little set backs that happen while opening.
Plus customers.

Excedrin helped a bit to get rid of the ache behind my right eye. 
So it hasn't really made a nuisance of itself. Just been a minor irritant.