Just chiming in to say that I, too, have serious problems with crowds and lots of people jammed into small spaces. If a bus is going to be crowded, I have to be right by the door, or I can't ride it. We try to avoid big crowds. I also had a panick attack on Kraken (SeaWorld) when the shoulder restraints clamped down on me, but I worked my way through it. Surprisingly, I didn't have a claustrophobic reaction on Mission Space, but I did have motion sickness issues. The CMs are usually very helpful and can help you assess each ride.