I don't suffer
sooo much with sickness on the rides, but suffer quite badly with normal travel sickness.
I even get sick when I'm the one driving the car - tell me, how on earth does that happen?!

Anyhow, I've tried pretty much everything on this thread without much luck.
Joy rides - no luck
Stugeron - no luck
Travel bands - I felt that they worked the first time for me, but then not at all afterwards. I thought it might have been all a bit psychological
Kwells (Boots have their own make of these too) - the active ingredient is hyoscine hydrobromide. I'd say these have worked the best for me. I have never felt drowsy on them, but they really dry you up and I kept needing a wee

Just keep drinking plenty of fluids.
Somebody also mentioned dramamine above... When I was in Spain at the beginning of the year, I had to buy some travel sickness meds and purchased ones called "Biodramina" - so I assume they contain the same active ingredient as dramamine (Dimenhydrinate). I bought the ones with caffeine in so I assume that one of the side-effects could be drowsiness

These worked fantastically for me, and I really, really wish I had stocked up. I stupidly only bought a pack of four
So, when I head over to Florida this summer, I'm gonna dose up on Kwells and wear the travel bands just for the heck of it. I'll then stock up on dramamine while there.
Hope the OP manages to work something out
Edited to add: I Just read that joy-rides and Kwells contain the same active ingredient - no idea why one has worked for me and the other hasn't??