I've researched these kind of symptoms, and the only common cause I could find on the internet from the few people that complained about this was that it was ca

I've researched these kind of symptoms, and the only common cause I could find on the internet from the few people that complained about this was that it was caused by an infection in the head/neck area. One person had an infected wisdom tooth, another one some problem with his neck. Taking some Vitamin D may help (stay under the 4000 UI/day tolerable upper limit). There's a forum where people with similar issues used gather at http://bcomputermonitorpain.runboard.com/ http://bcomputermonitorpain.runboard.com/ As far as computer monitors go, you could either use an old CRT monitor, or try a e-ink monitor such as the Dasung Paperlike, or a modded Android e-ink tablet.