My son is four yrs and 5 month old. He vomits after 15, 30, or 60 minutes. I took him to doc, and on stool there was many motile bacteria with pus cells. He was given anti vomit and turmoil but he still vomits. When taking him to another doc and check stool again , no bacteria, and he was given just anti vomit injection. He still vomits, it has been his third day. What shall I do , and what cold it be?