Hi r200biggles,
I remember as a kid I would almost always get sick in the back of the 727 and my parents would always say to me while I was puking, "So you want to be a pilot eh?". On my first training flight in a C172 I got sick also. Needless to say I was really hesitant on my chosen career. I am glad that I stuck to it. I ever really ever got sick again. I believe alot of it is mental. Once you actually sit up front and have to work (if you can call it work), you never get sick. Generally in all the airplanes that I have flown the ventilation up front is good. Just a few weeks ago I got sick on the coach taking us to the airport and was looking forward to getting into the airplane. Dont let the travel sickness thing prevent you from having a great career.
Take care