Thanks for your replies everyone. I've never tried ginger, so I'm going to do that. I used Dramamine on the flight to Italy last year, it didn't work! A friend who also gets really travel sick told me that her doctor often prescribes Dramamine, but it's a stronger dose than the over-the-counter packet, so I'll try that too.
Once again, thanks to everyone who took the time to reply. I'll let you all know how I got on!
tully33