Why do I get sick 90% of the time when I drink, and I have at most 1-2 drinks?

I’m 5’10” 28M 140lbs. When I drink, I usually never have more than 1-2 drinks/shots, and 90% of the time when I do, I get very sick. Not as sick as when drinking heavily, but sick enough to end my night and need to go home.

I just don’t understand what’s happening. At first I thought it was beer so I cut that out. But I still got sick. Then I thought it was cocktails, and I also haven’t been sick from just vodka in a long time so I thought it made sense that maybe the only thing that works with me is just vodka, but I don’t know if it’s just coincidence.

I’m not sure. I always eat food the day of drinking and a few hours before drinking. But maybe I need to eat food 30-60 minutes before drinking instead. A year ago on vacation I drank heavily but I would be drinking at dinner, eating food before, during, and after drinking. I never felt sick once surprisingly. It was also always just vodka.