Why can’t I [21F] drink alcohol without extreme nausea all of a sudden?

So about two months ago I had some drinks got a bit drunk as per but later that night I was in absolutely agony in bed with awful nausea, I couldn’t sleep very well and it lasted all the way into the late morning. I thought that was odd as I never had had side effects from alcohol like that. Ever since then every time I’ve tried drinking I’ve had awful nausea, even last week I went out for dinner with a friend and thought two pints won’t do anything… yet when I got home I was bed ridden cause I felt sick again. Does anyone know why this could be? It’s not the end of the world but I do enjoy going out drinking every now and again and I’ve had to go out sober the past couple times which is pretty sucky. Thanks