https://www.merriam-webster.com/dictionary/nauseous

They’ve even got a special note for people like you:

Those who insist that nauseous can properly be used only to mean “causing nausea” and that its later “affected with nausea” meaning is an error for nauseated are mistaken. Current evidence shows these facts: nauseous is most frequently used to mean physically affected with nausea, usually after a linking verb such as feel or become; figurative use is quite a bit less frequent. Use of nauseous to mean “causing nausea or disgust” is much more often figurative than literal, and this use appears to be losing ground to nauseating. Nauseated is used more widely than nauseous when referring to being affected with nausea.

Both are technically correct