Hello Dr My Son Is 9years Old..he Is Having Stomach

Hello dr my son is 9years old..he is having stomach pain....and feel like vomit but he didn't vomit...he had fewer in the morning so I gave dolo 250 he slept and when he woke up he feels absolutely fine....but still not eating anything...I gave lanzol junior empty stomach...is emeset solve the purpose and which one 2mg???please advice