There's no need to worry. If you've done the 60 degree bank level turns, the sustained 2g you feel in them combined with the world spinning by out the window is worse than a brief wings lelvel-ish 4g pull, which will more than likely be over in a couple of seconds. Physically you won't have any issues with it.
The spinning itself may make you slightly nauseous if you are doing consecutive spins. I don't know how your instructor will go about teaching you but I would suggest if you are given the option, to fly the entries yourself, rather than spectating while your instructor demonstrates. If you do start to feel nauseous make sure you say so, so you don't suffer in silence. It will only get worse if you try and continue.
Lastly remember to enjoy yourself, it's good fun.
