Translation of zwischendurch

I.E. stands for 'in example', and the translation of it is 'por ejemplo'. Is there a difference between this term in Latin American or South American Spanish? How would you say the same sentence in Central America?
Anyway, there are a lot of people on board and I no matter how high the waves may be, I always suffer from nausea or seasickness. I have not been on a small boat before. I will have to vomit.
Why do I never travel? This is a very good question, but I do not know how to answer it: On one hand, I like the landscape, but on the other hand it annoys me to pack and to drive or fly.