So far I have been lucky and never got Sea sick. I can remember when I was on the Song Of America getting back on ship in Puerto Vallarta the Captian came over the PA and said "We are expecting high seas, if you have ever been sea sick please take your medications now. If you think you may get sea sick, medication is available at the Pursers desk for free. I would suggest that tonight is a good night to enjoy staying in your cabin and watching a movie. Room service can bring dinner to your cabin. If you go out of your cabin, be careful and only go out if you need to"
I was young back then and just drank enough so that I swayed the opposite direction of the ship so I'd be level. I had dinner at the MDR and hit the bars. I was rolled pit of bed that night as I slept.