Try SeaBands. They are a wristlet that you get at your drug store. They work on the pressure point 3 fingers above your wrist. I was like you only I only got seasickness right after I had my tonsils out in 1990. Never use to get sick on trains or anything. Now I use those and the sea sickness goes away immediately for me. Used them on a Cruise for 7 days. Had to wear them sleeping and in the shower so bought several pair but wasn't sick once even when the seas were ruff and the swimming pool was almost emptying out each time a wave hit us. They cost about 7-8 dollars. No drugs or nothing. Try them.

Sounds like a load of shit to me. It can't hurt to try though.