When it comes to alcohol (and weed) I'm usually good without vomiting no matter the amount I drink but certain combinations of drinks will land me a hangover. I also have the weirdest hangovers. I have allergies so whenever I'm thoroughly hungover my nose is stuffed and I have a sinus headache (as opposed to the normal tension headache). My body is abnormal.
I made the mistake of four vodka-based drinks and then, if I recall correctly, tequila. And I think beer was in there too. Understandably, it's all a bit of a blur.
I'm also in my 30s now and I don't metabolize alcohol NEARLY as well as I did in my early 20s.