I did change the brand..from miller lite to Keystone light..ive always done the miller up until a month ago..that IS when it started happening. I have switched to rum and haven't had any sickness thus far. Thank you..i will look into the H. pylori test.
Either you have H. pylori infection of stomach or small intestinal bacterial overgrowth,....or you have changed the brand of beer...or...diet in generraly,...or something showed up, like some food intolerance (lactose intolerance, fruit intolerance), and effects of those interfere with beer.
Have an breath urea test (BUT) for H. pylori - this is the most common cause of gastritis/GERD.