Any advice?

Well, first of all, the showstopper we had in 1999 was one day out of 2,200 we've been on - so finite possibility, but near zero probability. The smaller the ship, the posher and more expensive it tends to be, but the larger the ship, the less it tends to rock. The epitome of stability is the Queen Mary II (its unique ability to imitate a rock is not shared by other Cunard ships - or any others for that matter).

There are also specific spots in the world which, in some seasons, are prone to rough seas (but are unlikely to be found in places like the Mediterranean or, outside of hurricane season, in the Caribbean, for example.

After watching literally thousands of passengers wrestle with the idea of seasickness, while some seem to absolutely be prone to it, the following is also true:

Sea-Bands - elastic bands worn on both wrists, with buttons that press on acupuncture spots really DO work (as do sea-sickness pills), but for many, the fear of seasickness has a psychosomatic tendency to be a self-fulfilling prophesy.

Jeff