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If you play long and always do some pauses inbetween, but you still have headaches, either you need glasses or you have some chromosomes there which increase your sensibility of motion sickness. Perhaps even epileptic seizures you don't even notice?
If you play 3D ego shooter games or something like that start with increasing the field of view and turning of motion blur, articial motion blur creates even headaches by people without any health problems.