About 30 years ago a chemist in a small seaside town in NZ which is know world wide for game fishing , decided to invent his own motion sickness pills after constant demands from charter boat captains to supply something for customers more effective than those sold commercial
The pills are so good that the little pharmacy sells them all over the world in the fishing charter boat industry. Unlike normal sea sick pills they wont make you drowsy..one of the two different pills you take from the bottle they supply keeps you feeling normal and the other controls the motion sickness.
Call them up and they will post you some. About US $15 for a small bottle. The place is called Paihia Pharmacy..I'm sure ot will be easy to google or find them in a NZ yellow pages. They have become so well known in the charter boat industry they even have their own name...they call them the Pahia bomb.
I've been giving them to passengers who get air sick for years ..not one person has ever got sick, even those who proclaim they suffer badly
Good luck