Hello
For me, driving the boat myself is the primary remedy: I never vomited while I was the driver
Very good, this is a remedy that almost always works for almost everyone.
Another is close your eyes and sleep.
Therefore, I suspect that seasickness is caused by contradictory information regarding location, speed and ev. acceleration .
If you are steering your most important source of information are the eyes .
In this case, the eyes are prioritized .
If you close your eyes, however, there is no contradiction to the information provided by the equilibrium sensors. These are left ear, right ear and ev. also stomach and may even contradict each other.
To reduce the importance of the equilibrium information, one can fix its position relative to the ship.
To work in the nautical chart I sit down and rest the elbows on the chart.
Or to cook I stand so that my back is pressed against the engine room door. Then the ship can roll but that doesn't change my position to the stove.
If you have to fix gear on an diveboot sit down on the floor so that your back is leaning against something. If the stomach still starts to tense after some time, stop working, look at the horizon and breathe calmly . You will soon be able to continue the work .
People sometimes react very differently. . Experiment what is good for you .
When you stand on deck you can move with the ship, then the horizon moves. Or you stand vertically, then the horizon stands still and the ship moves under your feet .
Refex-like gagging or vomiting without vomiting.
Almost everyone knows that you feel better after vomiting.
But you demineralize and dehydrate noticeably.
To avoid this, you can preempt vomiting by hanging leeside with your head down and provoking vomiting by regurgitating or anything else .
If you stop in time, the diaphragm will still move as reflexively as with vomiting
and you will feel much better same as with vomiting . May be you have to do this two or three times .
If it was to late : What to do after vomiting ?
From an old sailor I got the advice: eat and drink immediately afterwards.
I tried this once with a crew member who vomited all day . As soon as we were in the harbor, he went to buy food for a good meal . That was because I had needed quite a lot for him during the day .
He was very surprised that he had recovered so quickly and thoroughly.
The second disadvantage was there was a lot to clean on the lee side of the ship.