Why do I get dizzy when I watch a HD TV?

So I don't have anything HD except my iPhone. But I go to a friends how's sometimes & they have HD TVs. Well, when I watch TV or play a video game on them I get a really bad head ache. The headache is right behind my eyes & moves into the front part of my head. It gets really annoying because I want to spend time with her but a stupid headache gets in the way! Please give me some answers. I WILL be thankful.

I think you should see an optician, I have never heard HD doing this, what I have read and that 3D can give you headaches, that's why in it's present form it will fail

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