Whats the correct English "I got sick last night" or "I fell sick last night"?
(For whatever reason...) In the US we say "got sick" and "fell ill". Although, "falling ill" implies that it's just the start of something that's going to turn out to be much more serious and long term - Like: "He got sick with the flu, last week," as opposed to "She fell ill with cancer, as soon as they returned from the trip."
Of course, "fell sick", also implies something ongoing - so, I guess it's the "fell" part that makes it seem like something lengthy. "Got ill" (not very common - but still used) usually just means "vomited".)