Sorry, can't help. I've only been on 1 cruise and asked Boots to recommend seasickness pills suitable for diabetics (just in case). I didn't need them, as the only time I felt queasy was one night, going through a rough patch of sea. I woke up rolling onto my back and lay there, feeling the ship rolling. When I began to feel queasy I rolled back onto my side and felt fine.
I also purchased travel sickness wristbands but didn't need those either.
If you take these same precautions, hopefully you'll be ok, and like me, won't need them.
Enjoy your cruise!