It’s probably motion sickness , take a look at this link https://youtu.be/0CP0VX9XFXU There are medicine line vomistop and limelit candy to avoid vomiting. Also sleep is a better option. Keeping your eyes on the road whilst listening to music will distract your mind from the sensation of vomiting. Also don’t eat a lot of food especially dairy and oily products before travel. Thanks, i hope it helped.
Try taking an Avomin tablet before the travel,about half an hr before getting into the car and preferably travel on empty or take light food,do not eat heavy meals.Sniffing a lemon is also a good tip.
Another best option you have to break journey in short distance. medicine is a option but from that your partner will not enjoy your trip. 2nd option use window air dont use Ac and 3rd option if u can busy your partner mind in any discussion or singning a song. this will helpfull. thanks and enjoy