The quickest way to alleviate motion sickness, nausea, and vomiting is to lie flat, consume acidic foods, and, if necessary, take motion sickness medicine orally.

1. Try to lie flat: Due to individual differences in physique, some people may experience motion sickness when traveling, with symptoms such as nausea and vomiting. When traveling, try to lie flat, do not look at distant objects, and hold onto things around you with your hands to avoid the jarring impact on the gastrointestinal tract.

2. Consume Acidic Foods: Acidic foods are rich in vitamin C, which can prevent adverse reactions in the stomach. Motion sickness can be appropriately alleviated by eating some acidic foods, such as hawthorn, tomatoes, and oranges, etc.

3. Motion Sickness Medicine: If the travel time is long, it is best to take motion sickness medicine orally half an hour before getting on the bus, such as phenylephrine hydrochloride tablets, diazepam tablets, and diclofenac hydrochloride tablets, etc.