Vision and eye trouble

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I'm 8w4d but man if I use the phone for to long I get a headache. It's one of those eye headaches too. Like from straining but I know I'm not straining. Is anybody else experiencing this to? I'm really not even using the phone for that long either it's almost immediately when I pick up the phone the screen starts to bother me. When I scroll through things it almost makes me kind of sick.