If you are experience drooping eyelid, eye redness, tearing, runny nose, facial swelling, facial sweating, along with intense headache knife cutting-like or boring in quality, located behind the eye or in the temple, you may have attacks of cluster headache.
Headache located around the eye and at the temple area, associated with scalp sensitivity, blurred, double vision, could be a Giant cell arteritis.
Consult neurologist!