How long was your stint out there? The motion sickness was brutal for me at first. What finally helped was sticking to a real strict routine, same prep every shift. Also, I got these anti-fog wipes for my safety glasses that cut the salt spray glare way down. It never gets easy, but that stuff made it feel less like the ocean was fighting me personally.
Man, calling the motion sickness 'brutal' is spot on. I found that a strict routine was key for me too, just like you said. It really does take the edge off when the sea gets rough.