Consider:

http://www.reliefband.com/main.html

Cinnarizine is the most effective treatment I have
used but, like all anti-emetics, it is a little too
sedative to recommend for use in flight. Of the non-medicinal
remedies Relief Bands are the only things that really
have any benefit for me. I have never been sick while
using them although I have occasionally had longs spells
of queasiness as P2 in a 2 seater. This is more positive
than it sounds as previously, throughout 50+ years
of motion sickness, if I ever started to feel nauseated
I would inevitably vomit. As P1 I have never been
in the slightest nauseated while using the Relief Bands.

John Galloway