Thanks Rusty, I'll look it up. To be honest, just knowing that others have overcome this problem through/while flying is encouragement enough, so thanks for taking the time to comment.
I just completed my second hour in the air, and apart from feeling totally drained when I climbed out of the plane, it was another great experience. Crazy thing is, my instructor says I'm flying really well, and learning quickly

and we even sampled a stall (intentionally!) today, which was fun. Covered effects of controls, climbs, descents, straight/level and going from clean to full flap and back again.
The only time I began to feel a bit off was when we were flying over geography I wasn't familiar with... I kept bollocking myself which seemed to help a bit (it's ok to tell yourself to pull yourself together.... it's just harder when someone else tells you to do it!).