My instructor only just managed to get the plane back on the grass strip at Denham during my trial lesson in the 1980's. I lept out, threw up, got back in & taxied to the club house!! I was mortified as all I wanted to do was fly since before I could walk. I started to take airsickness tablets & they seemed to work, however by lesson 5 they weren't required anymore. You build a tolerance to it & of course by lesson 5 your too busy to worry about motion sickness. It didn't slow my commercial carreer. It will sort it self out.