I am a Coaster Lover who suffers from Motion Sickness (well, after having my son - before that, no problems)
I take 1 Less Drowsy Dramanine (same as Bonine) before a day of riding. It's worked for me for Body Wars, Star Tours, RnRC, ToT, plus several other non-Disney Coasters, some quite large....
I don't generally push the spinning thing - I'm really more into drops & inversions. I also add a 4 mg. Zofran (anti-emetic) before any hyper-coasters......
I plan to try my luck on Mission:Space. It hasn't NOT worked yet, so I think it'll be fine......
Good Luck!