Ive had a similar problem for a long while allthough at first I thought it mite be pressure related from when I dive, cause normally after the third dive down Id be done for the day but that changed recently and now Im back to it being the fault of the movement of the boat. I must have tried all the products we get here. Ginger pills didnt work, raw ginger just makes the puke taste worse. Valoid and stugeron didnt work either, even if I started drinking one tablet a day 3 days before a dive and 2 on the morning of the dive. A mate of mine even drink tablets they prescribe to epileptics and most times that doesnt even work. But I do think I have found a cure that atleast let me enjoy 5 to 6 hours at sea, I drink a sachet of Enos after about 20 mins on the boat or when I start feeling symptoms of seasickness and bam 5 mins later its gone. This led me to realise that the problem is in the stomach not the head so its worth a try and yes also have a good breakfast before the dive it helps settle the stomach. But if it does not work do try the rest of the remedies, the only way to find something that works is by trail and error and if all else fails have a packet of fruity flavoured mentos before you go on the boat. It makes everything nice and smooth and it makes it taste better

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Dive safe and shoot straight
- Hénré -
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"Thinking is the hardest work there is, which is probably why so few engage in it"
- Henry Ford -