I have been suffering with this for four days. The first day I just thought I was getting a headache. The second day I was on the recumbant bike at the gym, I had ridden for an hour, when I got off I immediately got extreme pressure in my head, so much so I thought my head was going to explode. I started getting nauseated and thought I was going to pass out as the pressure in my ear increased. By the time I got to the locker room it had subsided some what. I was driving home when I noticed a line of flashing light in the lower field of vision of my right eye. Over the course of 20 minutes the line traveled up until it was out of sight.