Yes, being sick or having motion sickness on a ship, can be something else to deal with.
I remember one time, actually my first cruise, we were at dinner in the evening, and the waves were so BAD
while we were eating, we ate very little, as every time we went to put something in our mouth, the ship would would move the other direction.
Looking back it is funny now, but then, well I'm sure you know or can guess how it was. That was an evening we went on a "diet"
that was not planned.