You're not the first person to mention the screen shake as an issue, though I've yet to hear anyone say that it's making them physically ill. I'd like to see it toned down a bit too, but I've gotten used to it at this point and it's not nearly as jarring as it was. As an aside - if something this innocuous is making you physically ill, I do have to wonder how or if you are able to play any video game - screen movements are pretty standard fare in this medium.
Maybe with time your eyes will adjust, as mine have. Hope it gets better for you.