I'm taking augmentin (amoxicillin and clavulanate) (amoxicillin_clavulanic acid) because of flu. And I have suffered from diarrhea so what I have to do?

Viral Illness. I am not sure why you would be on an antibiotic for a viral illness. The flu is not treated with antibiotics. My first recommendation for the diarrhea would be to stop the antibiotic unless you are on it for another reason other than flu.