I've had just about the same thing happening to me over the past several months. Starting with extreme difficulty seeing - double, blurry vision. I can barely see a computer screen any more, words double or shimmer, and I have increasingly bad visual snow.
About 2 months after the onset of all this, high pitched 13 khz chronic tinnitus in both ears. I barely can sleep and have been off work.
Turns out I have Lyme disease, diagnosed through a doctor and IGENEX test. Unfortunately it's not the easiest thing to get rid of, I'll probably be let go from my job. Not sure what to do either.