Yep i have always got carsick/seasick/trainsick ahhh everything sick, not fun and you are meant to grow out of it!
Sometimes i am alright as a passenger and othertimes not, pretty good as long as i am driving though. Poor DS gets it now as well and i just always make sure i give him something before we leave.
Apparently it has something to do with your eyes and ears not balancing out together that causes it. Makes sense to me anyway cause i am alright in a boat if we are moving but as soon as it stops...look out!