Look, the best way to stop feeling nauseated after drinking is to not drink to that point again. I know, I know—I sound like your mom. But seriously, pace yourself next time. Have a glass of water between drinks. Eat a full meal before you start. You know the drill.
Your hangover self is a wise teacher. Listen to them. And if you don’t, well, you know where the toilet is. Stay hydrated, stay horizontal if needed, and remember: this too shall pass. Usually by dinner time.