I don't think playing games would give you this problem. I think you should find some way to see a doctor. A message board isn't the best place to seek a diagnosis.
Very much agreed. However....I talked to my Dad (optometrist) and there are a few things to think about. Have you added any new or unusual stimuli to your eyes recently? Reading more? Watching more TV? Different CLIMATE? Sleeping enough or differently? Playing games more hours than normal? Etc etc.
Also....shit like this can happen depending on your age. Could be some sort of degeneration of the eyes. Yeah you might not have health insurance, but call up your local Eye, Ear, Nose, and Throat Doctor's Office and just see what a check up costs with no insurance. And if it costs too much ask if they know of any cheaper or free places you can go for an eye exam or the like.