Good day. Could you tell me who gives children from diarrhea?

Good day. Could you tell me who gives children from diarrhea? The child has been constipated for a week already. The analysis on infection is negative. We will submit an overall stool analysis, blood and urine tomorrow. I have no strength. Polysorb does not help, even if I give it to him, he rips it like a fountain. Even if I try to give it to him on an empty stomach, he rips it apart.