I know three people who've come back sick from cruises. The most interesting one was just last week: someone who had Mal de Débarquement Syndrome for six months. She was dizzy all the time. There is no cure.
This might be a good one to try on your boss if you want to avoid business travel: say you suffer from Mal de Débarquement Syndrome!
https://my.clevelandclinic.org/health/diseases/24796-mal-de-...