It is completely common for a new pilot to experience motion sickness under those conditions. Odds are that as you gain more experience, you will have less trouble with motion sickness. Commercial manuevers, stalls, and spins are not normally performed by most commercial pilots in routine operations, so once you get through training it should be a non-issue.

Aerobatic training might help, but you would probably have to do it more than once. But aerobatic training is a very good idea for an aspiring commercial pilot in case.

Motion sickness drugs might not be authorized for use by pilots while flying, but those pressure-point wristbands work for some folks.