Issues with beer

So I started drinking only beer a year ago and from that moment on even 1 or 2 beers hurt my upper stomach and sometimes easly get me tispy.I regularly take a lot of pauses of 1 or 2 months where I don’t drink so idk if it’s a tolerance issue or not .I was thinking it’s probably beer the problem cause the years before I used to drink liquor and cocktails and I never had any upper stomach issues even when I was very drunk and sometimes used to drink a lot and still no problems after that I started drinking only beer cause its cheaper 😭😭 and I still do now but I haven’t gotten actually drunk in a few months I only rarely get tipsy cause I don’t like the pain from it as its every time . I don’t get issues from any other drinks like sodas or any food and I got blood test done and I only have iron and vitamin D issues , had a small infection but took antibiotics for it and didn’t drink during . I don’t know what it is and since I am in my 20s I want to enjoy being drunk a bit even if I dont need it

Do you guys thinks it’s beer per se or other stuff ?? Thanks for the advice