Have you ever experienced these symptoms and could you help me identify the cause?

Several times in my life this has happened to me. It is sometimes accompanied by flu-like symptoms but not always. It starts with a burp. The burp has a nasty smell/taste to it. It’s sulfury and disgusting. The smell/taste grows more intense with each burp. After each burp I begin to get nauseous. The burps continue until the nauseousness makes me vomit. sometimes that will be the end of it, but sometimes it will continue. I don’t think it’s related to the food I eat, but I’m not 100% sure. Anyone know what I’m talking about?