What caused the sudden change of this ?

Iam not regular drinker i drink very rarely i always did because alcohol was never my thing much but like 3 to 2 years ago i could get always so drunk asf whenever i drank not eat or drink any water and i would always wake up feeling totally fine no hangover or nausea at all no matter what but now when i occasionally drink same or less alcohol and hydrate and eat food i always feel brutally nauseus and hungover puking the next day no matter what idk what changed