The blurry vision happen to me as well. I dont think it is an illness. It just happens when you focus your vision on a small target for too long. This happens to me when I play mania since you focus on the small notes and try to block out everything else out. Eventually, the point of your focus gets so small that everything looks like it is blurry. Then when you look at something else right after, your eyes dont have time to readjust to a wider view. This may be worse by the fact that you get motion sickness (which I assume you mean by traveling in cars is difficult). AThis is just an instance of your brain being confused that it sees movement but is not feeling the corresponding motions. Actually relatively common, of course in a variety of strengths. Not really sure this is something you can fix. Maybe if you do eye exercises to help with your ability to have focused vision t may help. Or glasses if you need them