Research...
...was done and continues at the allergy-center Florisdorf, University of Vienna by Prof.Dr. Reinhart Jarisch; he published his conclusions in "Histamin Intoleranz - Histamin und Seekrankheit" (Histamin intolerance - Histamin and seasickness); in a nutshell:Apparently Histamin makes us seasick. Factors for increased Histamin levels are:1. Diet, Histamin is found in processed foods, particularly cheeses and canned products, alcolhol, particularly red-wine and certain beers, some fresh foods like spinach and tomato.2. "Fear / Confusion", what he means here is the inability of the functional unit inner ear and brain to make sense of movement felt and movement seen, i.e. below it's worse. Both factors increase Histamin-level.Consume Histamin-blockers to disable the receptors (Cinnarizin) or Vitamin C which helps to absorb the Histamin. Assume positions that allow your body to "make sense" of the movement you are subjected to, meaning on deck; minimize movement, stay amidships.