Fever, diarrhea and vomiting are symptoms of gastrointestinal flu, which may be caused by unhygienic diet and viral or E. coli infection in the gastrointestinal tract. In this case, you can take drugs such as Ofloxacin and Flavopiridol to actively treat the gastrointestinal infection. If the fever exceeds 38.5℃, you can take paracetamol or acetaminophen extended-release tablets to reduce the fever. If vomiting is severe, it is recommended to take Si Mo Tang Oral Liquid and Vitamin B6 to stop vomiting. It is important to take care to replenish electrolytes with appropriate sugar and salt water to prevent diarrhea and dehydration. You also need to pay attention to maintain a light diet and a nutritious diet, eat more steamed egg custard, Chinese wolfberry yam porridge, skinny egg and lean meat porridge to regulate. You need to pay attention not to overeat, not to eat cold, acid, greasy and other stimulating food. Also need to pay attention to do a good job of abdominal warmth measures to avoid abdominal cold.