I used to work on offshore fishboats and learned a thing or two about seasickness. I used to get sick for the first day and recover. I had friends who would get horribly sick. There are remedies that work:
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Ginger. Candied ginger, cooked ginger. I used to start eating that spicy ginger candy a few hours before heading out, and have more every couple hours of the first day, and then I would be fine. This is in winter weather, deadliest catch sort of waves.
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Vitamin B. Vegetarians had some real problems with seasickness, but if they took vitamin B they were usually OK. On that note, lots of red meat works too.
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Fresh air and a horizon make a difference. Going down below is a recipe for barfing.
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Think carefully about what you eat before going out to sea. A big greasy breakfast is probably not the best choice.