Motion sickness is very much psychosomatic
Yes and no. I work at sea for a living and have never been seasick, even in 50' waves in the North Sea.
But on saturday I did feel a little motion sick, (though didn't come close to puking) on my first aero's lesson.
What I figured out over two sorties was:
a) When the instructor demonstrates it is far worse than flying yourself
b) Nerves, I was terrified before I did my first loop


which obviously makes you feel slightly sick in itself
c) Relax and look out. First I was VERY tense, as I didn't know what to expect. Gradually I started the relax and enjoy the view from upside down

Sortie two I was better but because of the "damage" done at the start I was feeling a bit queasy so didn't want to push it too far.
I think next lesson I'll be fine, but gawd knows how aero's instructors can sit there and laughing away
Ginger is a well know cure, so it may be worth trying that. Also keep your eyes outside and try and relax....
Good luck