As far as I have been able to determine no one has ever died or gone blind from 'visual snow' nor is it anywhere as common in an eye clinic as on the internet. The anxiety it generates is the biggest problem.
I have it too..I think it's all just to do with the anxiety try not to worry ...I know it's easier said than done lol. You will be ok.x
I have experienced these symptoms also, thousands of dollars later, visits to opthamologist, neurologists, other eye specialists and nothing. I read about suboccipital release and may give that a try.