Very sick (not hang over related) after drinking

Hi everyone

Recently I have had a few episodes where I would have a bunch of beer (till drunk, but normal/socially drunk), finish up the evening, go to bead, have a reasonably good (7-8 hour) sleep. Wake up feeling ok, no hang over just feel I little tiered. Then later in the day, I would get this violent sick feeling that I need to immediately run to the bathroom. It then lasts for about 4 hours and then just as suddenly completely passes.

It almost feels like I have been poisoned. This started happening here and there about 8 months ago and happens about 30% of the time I drink.

I don’t mix, drink pretty much the same exact beer and quantity I have been for over a decade.

I have had 2 general checkups with blood and lover/kidney tests and everything seems ok.

Has anyone had this or has any clue what this BS is?