I don't see how you could possibly die from motion sickness itself. However, you can die if subjected to 10+ G-forces. You can start to black out at 6 Gs, and by 10, death is imminent.
I have never been motion sick, and I hope I never will. I crave vestibular sensations. I am my happiest when riding a roller coaster, particularly one that goes fast and has lots of air time, such as the Magnum XL-200.
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Helinger: Now, what do you see, John?
Nash: Recognition...
Helinger: Well, try seeing accomplishment!
Nash: Is there a difference?