If it is impossible to sit in the front, and the trip will be long, then at the window, leaning your head against the back of the seat and looking out the window, it helps a little, the main thing is to tilt your head so that your eyes look slightly upward, even if your gaze is directed simply forward. Well, also satiety and sucking candy, they help me.
In addition to all of the above tips, you can try, in especially acute periods, to grope for the pain point between the thumb and forefinger. It may sound absurd and stupid from a medical point of view, but the pressure on this point, as it were, switches attention to it, and the nausea briefly subsides.
It's clear that this is not for a long journey, but suddenly it will come in handy :)
The simplest thing is to look out the window, preferably forward. If possible, sit next to the driver. Motion sickness occurs when you are rocked, but the picture in front of your eyes does not swing. The brain interprets the discrepancy from different senses as a sign of food poisoning and begins to fight with it.
The effect of motion sickness is greatly enhanced if you read. Usually there is less motion sickness in the front of the bus than in the back. Motion sickness is alleviated if the wind blows over the face.
I myself have suffered with this problem for a long time. And I tried to eat on the road and before her, all this changed nothing. But later I found out about 'dramina' pills !! Any pharmacy has and is dispensed without a prescription. Now I completely forgot about seasickness. You take a pill an hour (maybe less) before the trip and you don't even remember about motion sickness.
All my adult life I have been rocked in transport. Until now (I'm 21) I can't get rid of it. I love trips, but the thought that after a while I will vomit (if I'm lucky, in a bag, and if not, under my feet or on someone) spoils the whole impression. And this is what happens afterwards.
But at least I understood how you can delay this "pleasant" process of emptying the stomach. Before leaving, no matter how paradoxical it may sound, I eat tightly. On the way, I try not to look down (not sit on the phone, not read) and not sleep.
That's all for now)
I tried some expensive pills. Helped up to the 31st pit. I think the only way to get rid of motion sickness is to train your vestibular apparatus. Ride on a turntable swing)