I have an extremely bad peripheral vision.

Have you consult with an optometrist yet? Don't take lightly of anything with your eyes. They are rather sensitive and most of the eye illness if found in early stages are almost all curable. Stress and distress are possible factors but physically your eyes must be examined to make sure it is not the case. I can feel the pain and the fear of not being able to see as I have joined a group game before that was organized by a optometrist in which all of us were blindfolded for an hour to simulate a blind condition in an able body man. It is a dark world. It is so horrible that we all donate money to the charity for the blind and went to visit them the next weekend. I hope you can take immediate action.