Some people get seasick no matter what! However, non-drug solutions are readily available for the rest of us. Try to eat a good meal before getting on the boat. Avoid very fatty foods or acidic drinks (orange juice is one of the worst) and anything that dehydrates you (coffee, not great). Aim for carbohydrates, things that give you slow burn energy. If you start feeling hungry on the boat, you will start to feel nauseous too. Drink plenty of water and make sure you are not going out with a hangover (bad anyway, from a DCI standpoint).
Position yourself away from the exhaust and make sure that you can see the horizon or stationary objects. Your brain needs to relate the movement that your ears are trying to communicate. Don't concentrate on small tasks for longer than about thirty seconds initially. Setting gear up seems to be the time when most people start to feel queasy so try to organise your bag and make sure that mask and fin straps are set to the right size before you get on the boat.
Take medications well before you get on the boat. They tend to "freeze" your equilibrium and if you are already sick they don't work. And, if you get that feeling rising you can try pushing a thumb into your wrist (acupressure), also breathe in deeply through your nose and out through your mouth.
Eventually, you will get used to the motion and it won't affect you any more, just keep diving!
Position yourself away from the exhaust and make sure that you can see the horizon or stationary objects. Your brain needs to relate the movement that your ears are trying to communicate. Don't concentrate on small tasks for longer than about thirty seconds initially. Setting gear up seems to be the time when most people start to feel queasy so try to organise your bag and make sure that mask and fin straps are set to the right size before you get on the boat.
Take medications well before you get on the boat. They tend to "freeze" your equilibrium and if you are already sick they don't work. And, if you get that feeling rising you can try pushing a thumb into your wrist (acupressure), also breathe in deeply through your nose and out through your mouth.
Eventually, you will get used to the motion and it won't affect you any more, just keep diving!