Obsessed about my eyesight

I remember going through this a few years back. I was convinced I was going blind. It seemed everywhere I went lights would flicker. I had to say to my friends "is that light flickering?" to make sure it wasn't just me. For months I was prettified I was never going to be able to see again. I even had a few eye tests, diagnosed myself with a few diseases, when back and forth to the doctors constantly.