There are a number of us affected by the Dragon Riding.
I also get motion sickness, I have friends who are carrying me around everywhere.
The only settings that currently exist are
Dragonriding: FOV Effects
Dragonriding FOV changes do not occur if you have selected “Reduce Camera Motion” in the Accessibility > General menu.
Dragonriding: Full Screen Effects
Dragonriding top-speed full screen effects do not display if you have checked “Alternate Full Screen Effects” in the Options > Accessibility > General menu.
They work for some people but they aren’t stopping me from wanting to throw up. If I have to be solo I try to gain height and then glide, not looking at the main screen, just at the minimap or the big map. Ofc this is quite impractical and at times you just lose velocity or hit things.