Please state in which country your phrase tends to be used, what the phrase is, and what it should be.
Example:
In America, recently came across “back-petal”, instead of back-pedal. Also, still hearing “for all intensive purposes” instead of “for all intents and purposes”.
You don’t feel “nauseous” you feel “nauseated”.
EDIT: TIL “nauseous” can be used in place of “nauseated”. This usage has been common since the 20th century.
It appears both are correct. From merriam-webster:
Is it correct to say “I’m nauseous”?
In that case I think it’s ambiguous what you mean. I’m guessing you mean to say “I’m feeling nauseous”.