Antivert
"I have used Antivert for seasickness and it may be the only thing I've used that really works.  The over the counter medications for car sickness did not work for me.  Also the medicated pad you wear behind the ear (scopolamine, I think) litterly puts me out for hours -- maybe you could cut a small piece.  Antivert also makes me sleepy, but less than the others.  My friend has vertigo and uses it for that with success.  It has to be prescribed, however."