About a year ago, I became very sick during a C150 flight.
I didn't puke, but was close to.
Wind gusts of 35-45 knots, rain, ... after 30 minuts, it became too much! I was glad to be back on the ground...
Above that, I'm quite a tall person (6'5'') and a C150 really isn't made for someone of my length, certainly not in shaky conditions!
About 6 months ago, I flew from EBKT to CHR
in a C172 (about 3h flying, but with a stop after 2 hours), and did not become sick. This was of course due to the reason that the weather was good, and that we could climb to 7000ft once we had passed Paris.
Flying on a sportscraft is nice, but only in good weather conditions!