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Ok any of you Ironworkers get sick while travelling? I just found out to my dismay and embarrassment that I get seasick

It was supposed to be a lazy couple of days sailing a yacht down the coast of NSW 15knot winds and 1 1/2 metre swells but for the last 6 or so hours I spent throwing up every half hour! I just wanted the world to disappear. I've been sailing before and never had any worries nor do I suffer when flying or in cars.
So any tips on avoiding being sick? Do the tablets really work? Have you had any bad experiences sailing or in planes or cars? Why did my feeling sick only start when I went below deck?