If your systems are out of whack, your meals may come back. Our metabolisms are nearly as unique as our personalities. Some preventatives will work for some people and not others. Others will work, though with varying degrees of effectiveness. You may have to do some trials and experimenting to find what works best for you.
Nothing works the same for everybody.
There are two symptoms of seasickness, dizziness and nausea. Since a number of factors contribute to sea sickness and can trigger either or both parts, it makes sense to follow the following guidelines to reduce the chances of succumbing to it. Get plenty of rest before diving. Weariness and exhaustion can make you more susceptible to other things that can bring on motion sickness. Do your gear preparation early the day before diving and take care of other business well before a proper bed time.