HI Well come to HCM I really appreciate your concern, Viral fever need no medicine but it comes around once it finishes the course of disease and it may takes four to five days, only matter of concern is bacterial infection but it does not seems like this here. It is most advisable to avoid antipyretic if this is not the high grade fever or it is the hyperpyrexia (F 100 degree up) but body temperature can be brought down with cold sponging alone, diarrhea is also pretty common symptoms in viral fever and this also needs no treatment, but care needs to be taken for dehydration, else over all it is nothing to worry, hope this information helps.