well I've had migranes before and that does sound like what happens to me. I get a "waterfall" sort of thing way off to the side, sometimes left, sometimes to the right.
and it progresses to the partical loss of vision, like you have described... , then a pounding headache that gets worse and worse until I throw up... Then I sleep for 3 hours and the headache is gone and the vision returns mostly to normal, ususally takes a full nights sleep for the vision to be correct with me.
and Yes, reading, or watching TV, or anything that requres you to focus... that's what is the deal with me... it's like someone has something infront of one eye so you are seeing with one, and sort of half blacked out with the other, makes it nearly impossible to focus on anything specific.
I've never had it last more then a day, or really until I throw up and then sleep so not sure why it's lasting so long with you.
Did you get a headache?
Some people call it and "optical migrane"... I get the optical part but it's crushed out of existance by the headache that follows.
haven't had one in years, but when I was a kid in Jr. High... 2 - 3 times a month, all the way through high school.
some people say MSG will trigger them, others say dehydration can set it off.
if you didn't get the headache part, .... who knows, you may still have the migrane.
worst part for me was when I saw the waterfall... I knew it was comming and I didn't have any way to stop it... bleah.
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