You can buy "Opies" ginger from Waitrose. It comes in two varieties: crystallised stem ginger and Ming ginger slices.BE WARNED!!!The slices ar VERY hot and I have found it best to nibble on these. The crystallised cubes are more palatable. I also got quite hot when I started flying, usually 10 mins to landing-no jokes please! Flight crew suggested I monitor the situation and take note of aircraft type. They also explained it may be something to do withthe air flow and engines and pressure. It made sense when they explained but I'm afraid I'm not sufficiently technicallly minded to be able to explain it to someone else. All I can say is that the more you fly the sickness tends to lessen and the ginger helps. Believe me, circling round Venice for an hour and a half in a thunderstorm with the possibility of diverting and the ginger worked for me- coupled with a fab crew to see me through of course. I think you get your air wings like you get your sea legs! If you can't get hold of the ginger I mentioned then try a Canada Dry Ginger Ale from the minerals drawer.(Although carbonated drinks bring their own problems!!!!!!) Also, like others have suggested, sucking on barley sugar or some form of peppermint can also help. You'll be fine.