I Used To Be Able To Drink Up To Three

I used to be able to drink up to three drinks at a time (that was my max or I knew I would become sick or have a hangover if I went past that) but then one night after just one drink I was up all night sick, possibly vomiting but for certain having multiple bathroom visits. Ever since then, I feel sick if I even have one drink so I completely cut out any drinking at all, however, there are times I would really like one. Is a completely sudden onset of alcohol intolerance something that actually happens? I am fine not drinking, it just raises a concern maybe there is an underlying problem? However, as long as I do not drink, I feel great and have no symptoms of anything.