Except the OP states that he gets sick just sitting in the car.I have a friend with a similar issue. For him it's the regen breaking. When he tested the audi etron he got really sick. With a porche tycan he felt queasy but not sick. Once he turned off regen braking he was fine.
That's why motion sickness is low on my list.Except the OP states that he gets sick just sitting in the car.
One possibility is high frequency sound from the display, etc. When I was young, I remember my parents taking the family to a local clothing store where the florescent lights made a high pitched sound only I could hear. After enduring it for ten minutes, I had to go wait in the car so I didn't feel ill. Only in this one store did this affect me.It usually isn't the moment I get in. In the beginning, it took 20-30 minutes to manifest. When I drove the car more often, it started taking 5-10 minutes. And yes, I experimented one day and found that it happened without driving.