It is hard to row smoothly. I enjoy your dispatches immensely and am so glad to have found this Web site, especially as I'll be sailing to the Antarctic Peninsula in December with an Elderhostel group. I'm also wondering if all the layers of clothing described in your dispatch will be necessary in December. I'm glad that Shackleton is finally receiving well-deserved attention. His courage, fortitude, and concern for his men are far more heroic than other polar explorers, even though he didn't complete his original plans.
Some people never experience seasickness, while others can have a really rough time.
I'm fortunate that I only seem to feel disoriented and uncomfortable, but never throw up. You should definitely talk through the options in terms of medication with your doctor. Each option seems to have some mild side effects, which you'll want to evaluate. I took ginger pills every day, but it's hard to say whether my prescription medication or the ginger helped most. Motion sickness seems to result from a disconnect between the motion sensed in the proprioception in the ear and what the eye is seeing.