Try some stuff called "Bonine", it's like Dramamine, but doesn't cause the drowsiness. Take along a 6 pack of Ginger Ale, that will also help fight the nausea. When fishing off of the West side if Vancouver Island many years ago with my wife, she was sick for 8 hours straight. A little Japanese woman came over to my wife and gave her a little piece of candied Ginger and told her to chew and suck on the candied Ginger. It worked great, calmed her stomach and made her feel better right away.

Kev