Ok... first thing... its not turbulence, its bumpy air ... If you remember that you'll feel a little better.
Sweets & jubes will always make you feel better. No coffee will also help. Peppermint tea is good for settling down the old system and helps with nausea.
Try focussing on an object not moving when looking outside (it the wing) rather than the ground.
Have you considered you might be suffering slightly from hypoxia? Something to check out with your local DAME.