I'm not a Dr but after 20 years in the Coast Guard, over 10 years of that in not-too-calm seas I would say go with Scopace or Transderm
Whether you take the pills or wear the patch - both work and work well. Side affects vary a little, and rarely become serious. Most folks get cotton mouth and a little buzz. My suggestion to those who worked for me at sea, was to get the prescription and wear the patch (or take the pills) on a weekend when they would be at home and not driving, diving etc. Just to gauge the side affects if any.
I have seen folks who got sea sick in any kind of sea, every time. But when they wore the patch, they were able to go into the galley and fry up some greasy foods - now thats success.
Another thing is to eat properly and eat often. Hard candies seem to offer short term relief if you take them the moment you start to get ill feeling. We carry a bag of hard candy on every dive trip and offer them to those who start to look like they are about to sell their Buick
My wife wears the patch every time we go boat diving and when we do live-aboards.
I would check with DAN on any other medications you may get for this, just to be sure they don't contribute to DCS.
Don't feel too bad about your capt. When I was at sea my favorite snack was smoked oysters on saltine crackers, doused in Tobasco sauce. Those who were feeling ill usually went right for the leeward rail after I enjoyed one of my usual snacks
Cheers
Steve