Rapid side to side eye movements when I close my eyes. Also change of vision.

Hello, I am currently a medical student and am experiencing eye problems. I have had trouble sleeping for about a month and half and I realized there is a problem with my eyes. Whenever I close my eyes, I have rapid side to side involuntarily eye movements, however when my eyes are open these side to side movements go away. I feel like there is a problem with my lateral/medial rectus muscles acting this way. It feels like they become overstimulated when I close my eyes. It takes me a long time to fall asleep because of this and when I wake up the next morning I feel ultra exhausted because I feel like I haven't gotten enough sleep. I do not know why my eyes move side to side when I close them. They are no movements when my eyelids are open but the side to side movements occur once my eyes close. It has been like this for about a month and a half now and I am also experiencing a change of vision. I went to both my family physician and optometrist and both have told me that it might be a neurological disorder or problem.