Take a look at the ReliefBand at
http://www.reliefband.com/main.html. From DAN -This battery-powered stimulator looks like a wristwatch; electrodes on the underside are positioned over the P6 acupuncture site. When positioned properly, the wearer will feel a pulsed tingling sensation across the palm and in the middle two fingers.
The ReliefBand is the only device that has been cleared by the FDA for over the counter use for the treatment of nausea and vomiting due to motion sickness. It was also recently cleared for morning sickness. The device is water-resistant but it's not submersible, so divers should take off the device before entering the water.
Another similar product is the Sea-Band, made in England and distributed worldwide. The Sea-Band is an elastic band with a button that applies pressure to the acupuncture site, much like the ReliefBand, but without electrical stimulation.
Also, Ginger has been found to reduce electrical activity in the stomach, reducing contractions and thereby the nausea. A study conducted at University of Michigan in Ann Arbor proved ginger's effectiveness in relieving motion sickness symptoms. Take 1 gram of ginger orally, followed by eating gingersnaps, drinking ginger ale or candied ginger.
I haven't used either of the wristbands, but when I was a child my mother use to give me ginger snaps and ginger ale for nausea.
Now days I just eat a big ole greasy hamburger. Hmmmmm good.