They will not tell you what it is like to be seasick, but perhaps they will give you a little of the flavor - and I use that word with a shudder. Bile is pretty in a Technicolor sort of way. You realize how far gone you are when you start looking for the Dali-like patterns in your bile. This is long after you have passed the bounds of sanity. You are not going to die, but only because you lack the strength.
Nature is a wonderfully complex and subtle mistress.
By the time you realize that you want to die you no longer have the strength to lift yourself over the rail and drop into the soothing water. No water every looked so appealing. You realize that it is not the sea that is making you sick but the boat. No price, even death, is too high a price to pay, but the rail gets higher with each passing hour. Stephen Hawking was right.