Girls, hello everyone! I have such a question. My brother is 10 years …

Girls, hello everyone! I have such a question. My brother is 10 years old. A week ago he got a headache, noticed he pulled it out, and his temperature rose. The next day we went to an ENT doctor. Why parents didn't take him to a pediatrician is unknown (( The ENT doctor said his throat was red and prescribed antibiotics and anti-inflammatory drugs. But for a week his brother has been having stomach pain and watery stool. He took a course of Lacta Dji and Biflakt Active. It doesn't help. Still, his stool is watery and his stomach hurts. What would you recommend doing? Maybe some tests need to be done? On Monday we will go to the