How to treat sudden high fever and diarrhea in a 3-year-old?

Patient's question:

At noon, my child wasn't feeling well, so I took his temperature, and it was 39 degrees Celsius. I quickly gave him Nimesulide and Cefixime Granules. In the afternoon, his temperature dropped to 37 degrees. By the evening, he started experiencing nausea and vomiting again. I gave him Montmorillonite Powder, but he still had diarrhea at night, with a temperature of around 38 degrees.
Approximately yesterday morning, his temperature reached 38.5 degrees Celsius, and I took him to the hospital. The doctor asked a few questions, checked his blood, and told me to go home and focus on giving him the medication. But now he's still not getting better. Just now, I took his temperature again, and it was as high as 39.5 degrees Celsius. I'm really at a loss of what to do. Please help me out. Thank you.

Doctor's answer:

Your child is likely suffering from viral gastroenteritis, with main symptoms including high fever, nausea, and vomiting. It is recommended that you first lower your child's temperature. The Nimesulide you are using is very effective; just one oral dose can control the temperature for about five hours. Additionally, I suggest taking your child's stool to the hospital for testing to check for any other possible contagious pathogens. The main concern with nausea and vomiting is dehydration. If there is no significant weight loss, you can focus on administering Montmorillonite Powder to your child.

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