My husband gets motion sickness, vertigo, pretty much all the things they warn you about. So naturally I dragged him on Soarin' with our DS4. We were on row 1, which does go the highest (was a bit distracting because you could see the top of the screen, kind of ruined the effect a little, try another row if you can) Happy to report that my DH was fine, he loved it, we all did. I think he makes this stuff up sometimes!! No seriously, he doesn't get it too bad, but he finds Star Tours pretty bad, he can manage it once, and that's it. I thinks it's an optical problem, he loves regular roller coasters.
By the way it was super busy when we were there (May 22nd), wait times of about an hour and more, so getting fast passes is a very good idea. Or get on it early in the morning, and get a fast pass for later. It really is a cool attraction. I so wanted to dip my feet in the ocean as you went zipping past.