Have you tried using the wrist bands thay can help with travel sickness? Both my children and my husband really struggle with this and the bands sometimes help
I felt sick after only going 12 stops on the bus once but I got off so I never was actually
i wore a mask even way before covid to cover my nose from the bus fumes which get me almost violently sick and i take the sideways seats not the front facing ones which feel the sickening rocking of the bus stopping/going all the time.
You even get motion sickness if you look out the window or at the horizon??
Actually another time I felt a little dizzy when I saw things going past and I was going to a wedding, I was more concerned for my sister who always does it and takes motion sickness tablets though. I just looked down mostly and even when I looked straight ahead I felt dizzy