18mo baby vomited about half an hour after being put to bed. Poor love has been sick about every twenty minutes since. No temperature and no crying so do not think she is in pain, however she is now just bringing up green bile from the bottom of her stomach. She is currently lying in bed with her Daddy trying to get to sleep. We have tried to give her water to drink but she won't take any. Is this just a bug or should I be calling the doctor?