Been there, done that. The worst part of sea sickness is feeling like you are going to die, but knowing that you won't.
I used to be a mate on a charter boat. The first couple of trips each season were pretty rough until I got my sea legs back. I found Dramamine II (non-drowsy formula) works pretty well; there are other non-drowsy anti-seasickness pills out there. The key is to take them before you leave the dock.
Stay outside, but as close to the center of the boat as possible to minimize the rocking motion, and keep your eyes focused on the horizon. Don't even think about reading when you are queasy. Try to keep upwind of the engine fumes too whenever you can. Gas, diesel - either is nasty when you don't feel good.
Eventually it will pass and you'll be laughing about it later on.




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