What does it mean when you dream of vomiting white round stones?

The vomiting in this dream clearly represents getting rid of something toxic, unhealthy or just plan bad. There is a sense of having taken in (information, advice or beliefs) something that makes one sick or disgusted, and now one is violently expelling that stuff. The white stones are more difficult to interpret, because they might symbolize any number of things. They might be bits of information, a collection of beliefs, items used in gaming (such as marbles or Poker chips) or memorabilia.