I realized about ten years ago that what I was expering wasn't normal. The condition was completly unknown at the time and I got multiple MRI's, my eyes and nervous system checked out from every angle and there was nothing abnormal.
Talking with many people I know it turned out that this condition is surprisingly pretty common, though in a mild form. People told me they saw some form of constant noise too but dismissed it as normal.
Your article got me to check the condition out again and it turns out there is new research from May identifing something wrong with the brain of people under the condition.
It's nothing life threatening like you're story, but still it's something you have to learn to live with it's there 24/7 even when you close your eyes and can be imparing at night.
http://www.eyeonvision.org/news/107-visual-snow-research-stu...
http://en.wikipedia.org/wiki/Visual_snow
Sadly I'm not in the US and there don't seem to be any research studies in Germany. Therefore I want to shout out if anyone on HN suffers from this condition, maybe hasn't even realized it because it manifests in mild form. You can all help the understanding of the condition.