Absolutely normal! I was queezy day after day until I could hover. Many rotary pilots hate big dippers / acrobatics / fast jets. Helicopters in the main are meant to be flown smoothly. I have never heard of anyone whose nausea hasnt settled with their hovering.
Many of us are still overwhelmed - if not all the time then at least when the going gets tough. Training and experience will convert the stress into respect for flying so please persevere - it is well worth it