extreme vomiting

Is it possible to develop an intolerance to alcohol? Ive been drinking since 17, not excessively, and im now 21. a bit more than a year ago i started having really excessive vomiting after drinking (8+ hours of nonstop throwing up even when its not possible to/just gagging) and now it started to be even after 1 drink. im not sure if anyone is familiar with medical issues that could cause this or if its just an intolerance that has developed? doctor recommended prilosec which didnt help. thanks!