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Please take warm milk with excess sugar daily at bedtime and along with it two spoons of Duphalac (Lactulose) syrup every day for a week. Eat a lot of fresh vegetables during the day and drink a lot of water. You may also eat papaya every day that is very good at clearing the stomach.
Regarding your second query, you have a tendency of nausea when you travel. Many people also have this problem. You can chew a candy or a mouth freshener when you travel. Do deep breathing when you feel like vomiting. Eat light, and your tummy should not be full while traveling. You may also take an antiacid before traveling.