I think it is important to remember that the most common cause of rapid vision changes like what you describe are changes in blood sugar. I think it would be important to rule that out first. Oh — double vision in a lot of us is due to high intracranial pressure WITHOUT papilledema (swelling of the nerve head). Did you see the results of some of our work and research in this area in The Driscoll Theory? I hope this helps! Looking for changes in our eyes and vision is an important first step in locating underlying problems in the patients at POTS Care. It’s amazing what is getting missed in most of us!