My 5 year old son was hit by diarrhea, vomiting and stomach gases. I visited a doctor

Heart Murmurs have nothing to do with gas, diarrhea and vomiting. What to do is to look for the cause and treat it, especially to compensate for what the child is losing from water and electrolytes. Heart failure should never be neglected. It is necessary to introduce the child to a cardiologist and pediatrician. And determine the type and cause to determine the type of treatment to be followed