I've been flying 3 times with the Air Cadets on Air experience flights. I usually fly (I think) I the Grob 115.
On my first flight we did 60 degree turns, and I was not keen on the G. My pilot told me that if you do experience the G while turning, and it feels like putting you off, try tensing your stomach muscles (sp?).
I've tried that in my last 2 flights and it works
I had one big shock last time, when I had control, and my pilot says "Look what happens when you do this" so he closed the thrust lever and the nose suddenly dropped, geez I just wanted to shout "AHHH!" Then pushing it in full throttle again, giving me positive G; both G as bad as each other.
When I work for my PPL (hopefully soon) I hope I can keep my concentration on flying the aircraft than whats going on with my stomach! lol.