Working as a medic at sea I had a lot of noobs come to me with 'mal de mer'. Aside from ginger biscuits, which do help a little. One trick that was quite successful was, surprisingly enough, put a colour filter over one eye. A pair of sunglasses with a lens knocked out kind of idea. Yeah, I know. But it works. You see, motion sickness is caused by a disconnect between what your eye sees & what your inner ear (balance organ) detects. That colour filter causes your brain to work around the visual differences, slowing it down, interrupting it's ability to manage the flow of data from the inner ear. It's just enough for your brain to choose to ignore some of what's coming from the inner ear. If you blink at 4-60 times a second it turns it off too. You only need to use the filter for a few days. It isn't a panacea for mal de mer. But it allows you more time in the headset, making it easier for you to get used to it.