i guess having your eyes out of focus for such a long period of time could give you a headache, you really shouldnt strain your eyes like that. do the eye healing technique.(rub your hands together, generate heat and hold your hands over your eyes) also, get up and stretch, drink water or whatever inbetween photoreading sessions. i dont beleive photoreading gave you a cold, however, since there seem to be no health risks in photoreading. maybe it is just a coincidence. hope you feel better soon.
