I've always had motion sickness when trying to read or write something while in a moving car. When I started flying I recall some of those nauseous feelings coming on, but I had always known flying was what I was meant to do, so I pushed them aside. You'll find that a lot of it goes away as you commit your focus to training and all the tasks that go with the job. It's really quite remarkable: I never get any nauseousness when reading checklists and performing duties during bumpy weather or taxiing, but trying to read a sentence while riding in a car still upsets me. Stick with it!