I saw Avatar in 3D over Christmas and my son and hubby had to help me to the car I was so dizzy! The woman in the seat next to me got motion sickness and spent most of the time with her head on the arm of the chair. The eyes and ears are closely connected and it is the disturbance in the ear canal(caused by what the eyes perceive) that causes dizziness. Even my son was disoriented when he left the theatre...the effects were unbelievable, though!
I went to one of those things also, Alice. Before they showed the movie, which was not just flat against one wall but surrounded us on all sides, some guy says 'Raise your hand if you feel uncomfortable and need to leave'. Uh...it was a trip on a Blue Angels jet, with all the twirling and dive bombing..even the ground shook for effect...I thought I was gonna die and not only did I raise my hand, I was screaming 'get me out of here." No one responded. I puked my brains out when I got out of there. Never ever again.