Why do I gag when I drink alcohol?

I used to be able to drink without any issues. My girlfriend and I liked to drink vodka + orange juice and sometimes trulys.

But for some reason, alcohol has started to make me gag and get sick. Literally five minutes ago, I had some orange citrus flavored Truly and immediately gagged and then threw up. I can no longer drink vodka for the same reason.

This didn’t used to be a problem and I am thoroughly confused. It’s almost as if my body just rejects it now. My guess is that it could be the flavor but i don’t know. I’ve had margaritas and a berry flavored Truly a week ago and had no problem.

If anyone has any ideas, please enlighten me.