I, too, have severe motion sickness AND detest the "falling feeling," so I am not a coaster girl. However, Disney World is my FAVORITE vacation spot! There's so much more to do than just the "thrill" rides.
Dis703, I haven't ridden anything on your list of "can't-do" rides except for TestTrak and Soarin'. TT is not my favorite, but I can handle it once, although the outside high-speed curve makes me a tad queasy. It's still fun and over so quickly that I am usually OK. Soarin' usually isn't a problem, even though I don't usually do too well in IMAX-type projection things. The good part of Soarin' is if I start to feel queasy, I just close my eyes and if goes away! I also have no problems with BTMRR- as long as I only ride once!
One problem I had last trip was on 7DMT. I was fine on the ride until the cart stopped at the Cottage. I was suddenly overwhelmed with the most awful motion sickness. NOT queasiness, but full-out motion sickness. It was all I could do to get off the ride and find a place to sit, and even after sitting for about a half-hour and having something to drink, I still didn't feel 100%. It was pretty disappointing.