What Causes Vomiting And Diarrhoea After Drinking Alcohol?

hi, so I have drank a couple of drinks over the past year, once I blacked out (the first time drinking), then I would only drink a couple of drinks, barelt getting a high, then I got drunk, was fine. I have never drank weekly and all of the times I had drinks, it was spread out by a month or so. Recently, I drank about 5, 2 in about half an hour (we were playing a game). Nonetheless, I felt fine afterwards, until about 4 or 6 hrs later, when I woke up vomitting, had diarrhea and the shakes. A couple of nights later I drank only mixed drinks & I had the same problem. Then 2 weeks later, I drank half of a pina colada, I didn't even taste the rum, but within 6 hrs, I was back at the toliet. What's wrong with me?