I used to get airsick in C152s and similar, and still occasionally do, even when I'm flying, if it's really bumpy. It's almost never happened to me in helicopters; they're much much better in turbulence. The only time I remember was after doing the R44 conversion in the US, then doing the test to get the rating added to my licence in the UK. Strong winds, low cloud, rain, and the instructor making me do autos, confined area approaches etc etc in quick succession. When we'd finished he commented on how well I'd done despite only 5 hours in the type and difficult conditions...and I didn't think it was the time to tell him that I was feeling very queasy.
