Simply stop drinking. You said it yourself, little doesn't make you throw up. Meaning your system can not accommodate pass a certain amount of alcohol, otherwise it reacts. It can't be more clearer than this. You already know the answer. There's no medical enhancement for beer consumption.
Why would you want to consume more of something you know is not good for your health? I don't see wisdom in that. The best thing to do in this case is to either quit completely or stick to the number of bottles that won't make you throw up.
As it has been pointed out, be it more or less, people drink for different reasons. When we do things we know aren't good for us, we all have our reasons for doing that.
Refrain from “hair of the dog” or drinking more to “feel better.” Give your stomach and body a break and don't drink again the night after a vomiting episode.
When you drink alcohol on an empty stomach, much of the alcohol you drink passes quickly from the stomach into the small intensine, where most of it is absorbed into the bloodstream.
There is possibly no way for you to stop vomiting after drinking a lot of alcohol if you really want to stop vomiting then you should no drink a lot of alcohol