At work I'm on the computer all 8hours all of a sudden I have double vision on things I don't pay attention to also pain behind eye this dry eye?

Dryness possible. Computer work is quite drying and i advise those with steady computer use to keep a bottle of lubricating drops next to the video screen to use frequently. Doubling of objects out of the line of proper focus is normal although we usually ignore this. Probably the fatigue of steady computer use has made you more aware of this normal image. Relax for five minutes every 1 1/2 hours.