It was probably due to thermal activity rather than the wind. Going up and down is much more likely to cause you problems (like feeling sick/sweating) than going side to side. Look up how the vestibular system works, understanding the causes should hopefully help your brain make a little more sense of the whole thing.
My first flying experience was in gliders. During my first few flights I was quite aware of the changes in height experienced in turbulent air, although quickly I became accustomed and got used to it as the brain adapts to the new sensations. As a general rule, before spending the £80k on an ATPL course, I would do some more flying first before you commit. Gliding would be an inexpensive option that will greatly benefit your future career. As I said, the air can be quite turbulent and a glider is very susceptible to the effects. You will adapt quickly; your body will learn to ignore the accurate information provided by your inner ear and will learn to judge motion more sensibly. This will occur rapidly and you shouldn't let your unwelcome experience put you off. Getting some hours in before you take the financial plunge is crucial as it is the only way to see if you like it. Understandably, you wouldn't have enjoyed your recent flight and therefore you won't be able to make a honest and considered decision until you learn to ignore the symptoms. The only way to do this is through perseverance.
Look at the medical and health forum on PPRUNE where there are countless articles regarding motion sickness.
Good luck and keep on going. You'll be flying on your own and grinning like a gooden' in no time. Motion sickness would be the last thought entering your mind by this point!