"나 차 멀미 해요" or "나 차 멀미 나요". "나요"(basic form is 나다) is a kind of difficult word. It means "get", "grow" or "become". It would be wise to memorize it as a collocation. "멀미 나다", "차멀미 나다", "배멀미(seasick) 나다"..