How to Handle and Solve Nausea and Vomiting in Children?

The child has been having diarrhea since yesterday afternoon, vomiting after eating in the evening, and having another loose stool at 3 AM. He vomited immediately after drinking milk this morning. He also has a fever of 38 degrees. What should be done? Previous treatment and effects: No specific help was sought. I just want to know what caused it and how to treat it when he vomits after eating.
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