Hello, I need advice. My son (1.4 years old) had vomiting for one day from…

Hello, I need advice. My son (1.4 years old) had vomiting for one day from Monday to Tuesday, and since Tuesday until Thursday he had a temperature of 38 and 5. It never went down. We called the doctor twice during this time. He was prescribed only medication for fever. Today the fever is gone, just 37. But in the evening diarrhea started. He's passing greenish water. What should we do over the weekend, how can we help?