What condition could this be?!

What condition could this be?

Recently i've been having slight pains in my head through out the day. Some would be really suddenand quick, and some would last for around 5 seconds. It seems that eaither light is triggering it, or my blood pressure or something. I'm not sure exactly what it could be. I haven't been feeling nausea or anything. And they aren't head aches, they just feel like someone pulling on a vein in there.

3 weeks ago
Sometimes when i feel light headed it hurts too. But they only happen like 5 times a day. Its been happeining for i would say yesterday, maybe the day before that.

3 weeks ago
Also, it seemed that yesterday when i had them they were just as painful. Today i just had one this morning after i went downstairs from waking up about 5-10 minutes ago, but then all day they weren't that bad, just little sudden pains that would go away almost instantly.

3 weeks ago
And i drink water like no other, so its not dehydration. I literaly prob drink about 6-8 cups of water a day, and its a big glass too. Its about 9 inches tall and about 5 inches wide of a cup. So its a big glass.

It's really hard for someone other than a Dr. to say what it could be. Usually high blood pressure doesn't cause sudden flashes of pain like that (I have HBP). Many things cause headache or pain...neck muscle strain, sinus infection, allergies and surprisingly, dehydration. If you don't drink enough fluid during the day, that can cause headaches too. But, if it persists, I suggest you see a Dr. Another thing you may want to ask him is to check your ears. Ear pain can cause a flash of pain too.