I've had the same problems for about 6 months now. It definitely correlates with my anxiety (they both act up at the same time). About 3 months ago I had a panic attack the day before my appointment with the opthamologist. The next day, she told me I have a picture-perfect retina and good vision (though I wear glasses with a light perscription).
I usually notice that my visual disturbances go up after my morning cup of coffee and get better throughout the day. I've also experimented with telling myself to look for them for an hour or so, and sure enough, I was seeing all sorts of things. Once I stop thinking about them, they go away. The transient blind spots are the scariest ones, but overall I'm starting to become desensitized.
Take into consideration that some of these symptoms are migraine-related (especially the zig-zags). I get migraines every once and a while, so I know that my brain might just be a little goofy sometimes. It's nothing to worry about!
In western culture, we are trained to think that everything has an explanation. Usually, that explanation is anxiety. However, I also believe in a more Buddhist perspective: some things just "are". They are there, and learning to accept the symptoms is the best bet!
Good luck and take care of yourself!