I don't have a problem on the water, but I do get motion sickness when I am flying or in a car. I saw a insert in a magazine for wristbands that are supposed to help you with motion sickness and I decided to order them.
The best ten dollars I have ever spent. The Sea-bands are two basic looking wristbands that any sports player would wear only they use accupuncture to trigger your centers of equilibrium. There is a small white dot on the center of each band that you place over the pulse point on your wrist. This small band corrects your equilibruim and calms down your nerves so that any nasuea you were feeling will ease.
I used the bands for the first time while taking a long drive and never felt even the slightest bit sick, two months later I got to try them on a plane for the first time. If you have any motion sickness I highl recommend the bands, they even got approval from the food and drug administration.
Wearing it is the only thing that I did not like because you have to wear it in order for it to work and when you want to wear pretty bracelets or other jewelry, it kind of clashes. For the time that I have to wear it, for the good effects, it is very worth it and I found that slipping it off for a little while did not reduce the effects too much and I could handle the sea sickness just fine.