Upset stomach even from 1+ drinks

Has anyone experienced this?

I used to be a social drinker until 2016. and then started my weightlifting journey. Now that I decided to stop my semi-professional hobby I have the occasional drink. What I have noticed is that my stomach gets upset from anything beyond one beer accompanied with a mild hangover (yes, even from 2 beers).

Has anyone experienced this? Should I get myself checked?

Fyi, I feel perfectly fine otherwise every day. More than fine, I am able to move huge amounts of weight, I follow a strict diet, buy my stomach has 0 issues on cheat days/refeed days.