I think it was irritation from my contact lens as I ended up with a slight headache behind my right eye.

And after finally finding a moment to take out my contacts...the headache has significantly decreased, though it's still hovering around as having an irritation in my eye has tensed up my neck muscles and moved the tension down into my shoulder so until I can get the shoulder to relax...maybe with a shower or something, I expect I'll still have a bit of an ache behind my right eye.