Well the thing with vomiting is this: when you drink, you have to go the bathroom more (urine) because your body is trying to process the alcohol, (which is identified by the body as a poison), out of the body so it does not damage your system - a defense mechanism, if you will. But when the body can't keep up, it looks for other ways, such as vomiting. Now, if you vomit because you tried something and can't stand the taste - nothing to worry about. Vomiting isn't always a reason to go to the ER, but it is, by definition, a symptom of poisoning - particulary for this case, alcohol poisoning.
