After we got back from the E.R. my son started coughing and sneezing a lot. When we were in the E.R. earlier he started feeling fine, his fever had gone down and he stopped coughing and sneezing. The doctor said that it was just a simple viral infection and my son does not have phneumonia. But when we got home his fever started to go up high and started coughing again. What medications should I give him and should I bring him back to the E.R. ?