I have to say that I did not know how sick I can be on the travels until I got this new job that require a lot of trips, both by plane and by a car. It is not a problems when it does not last for long, but sometimes, when it is more than 4, 5 hours I get in trouble. How to prevent gastrointestinal problems in passengers?
I know what you are talking about. I had the same problem couple of years ago, again because of the job. Luckily, I had short destinations, but it was still a problem for me. Then I started taking care about what I eat before and during the travel, mostly fluid food, cold one. And always carry some medication for this problem. I have been using Pepto Bismol, it worked really great.