Often, if I drink even one drink of alcohol I get a headache and vomiting the next day. This used to only happen with red wine, then progressed to beer, and now even one glass of white wine or 'hard' alcohol will make me sick the whole next day. What is this? It doesn't always happen with one drink ( I no longer ever have more than one). I don't want to get drunk, but I would like to understand what is behind this so I can figure out what is making me sick and then, hopefully, enjoy a glass of wine once in a while..