I was afraid I'd have to skip M:S, because I thought I'd get sick and claustrophobic. I ended up going on it, and it wasn't nearly as bad as I thought.
I didn't get sick at all, and I even kept turning my head to speak to my kids. I felt fine the whole time, and I was totally unaffected after. It's amazing how complex the human body is, how people can have such a variety of reactions to the same stimulus.
I guess ther'es no real way to know ahead of time how you'll react. According to my history, I should have thrown my guts up, had a massive headache, and had a panic attack from the closed-in space. But I didn't. Lucky for me, I think, since I was taking a big chance.