I have had the exact same fear every time I've travelled by ferry! I coped by going to look around the shop on the ferry, going outside and looking at the view, going to the cafe for a drink and basically keeping myself occupied. I figured if you feel ill the last place you'd be is in the cafe or looking round the shop. It's good being outside too - all that fresh air and looking into the distance, well, ithelps you toconcentrate on something else other than people around you getting travel sick. Or maybe you could distract yourself with reading a good book or listening to music.
Another thing I've found is the actual ferry ride is never as bad as what you build it up to be in your imagination beforehand! You will most likely end your ferry journey wishing you hadn't spent all that time worrying about something that never happened! I travelled to Ireland from England a few years ago and worried myself to death about the journey by sea out there as I'd heard the journey could be so rough making so many people ill. Well the actual journey, both there and back, was perfectly fine! The sea was so calm and nobody was ill.
I hope you can manage to enjoy your trip - I'm sure everything will be fine. Please let us know how it goes!
.•:*¨¨*:•.Tracey.•:*¨¨*:•.
Fall seven times, stand up eight.
- Japanese proverb