Try this
I had problems with notion sickness during USAF Pilot Training. I did the Scopalomine and Dexadrine medication routine, it helped a bit. A question for the sufferers out there: how do you feel AFTER you've lost your lunch? It almost became routine for me to fill a bag early in a flight, then tie it up and go on to to do every maneuver required. After I'd lost it I was FINE, no problems, no worries. Finally a senior USAF Flight Surgeon told me it was anxiety and stress rather than motion. He said that a common reaction to stress is to take REALLY BIG breaths in an effort to calm down. He told me that doing that could actually add air to your stomach in addition to your lungs. Air in your stomach will try to come out through burping, but until it comes out, a stretched stomach adds to the motion sensitivity and nausea. So there you are; feeling more nauseous and air (and lunch?) is trying to get out of your stomach.
I concentrated on NOT taking those big stress relieving breaths, I didn't let myself detach from flying when the first feelings began, I stsyed involved. Just because you get those first feelings nausea doesn't mean you're going to throw up. You can pull it back. It's not a given. Don't surrender to it. Don't detach from flying, don't try to calm yourself by breathing deeply. I beat it.