Being front of a screen, i feel eye strain, terrible confusion(even nausea), headaches, even within 5mins! what to do? and whom doctor should i go to?

Migraine?: Sitting in front of computer at home/school for long can cause problems if you experience migraine. Following common sense precautions such as taking regular breaks, using anti glare screens and good lighting can help prevent this sort of difficulty. Sitting comfortably very important when you use computer to avoid muscle tension building up in head, neck ; shoulders. C neurologist if no better.