I have a slight headache forming behind my right eye currently.
Which isn't that surprising considering I had a nuclear migraine last night.
And a semi-stressful day at work today.

But the main causation of this particular migraine may be my contact lens.
As I tried to put in my current one this morning...only for it to feel wrong on my eye. Like it wasn't fitting right.
And knowing that if it wasn't fitting right now...it would probably irritate me later, I ended up pulling out an old contact lens that I had on hand and placing it in my eye to see if that would help it.
It did. Which yay.
But downside is it's one of the old lens that is the weaker prescription.
So there's a bit more of a 'fight' happening between my left and right eyes to have a good focus going on. 
So it's no wonder there's tension building up in my neck as my eye is probably struggling to see as well as it has been seeing.