I once had a grad class that let out at at 10pm. On the bus ride to class, I was fine. On the ride from class my stomach was in my throat, all the nausea. After a few classes I figured out the difference: on the way to class, there was traffic and people getting on and off. On the home the bus just booked it over all the potholes because it didn’t have up constantly stop.

That’s also when I learned Dramamine [anti-nausea med] makes me wicked nauseous on an empty stomach.