Hi.. thanks for writing to us. i have gone through your query and completely understand your concern. Flu or influenza is a viral infection caused most commonly by influenza virus. children below the age group of five and adults above 65 years are more prone to this infection especially in winter. there are many types of flu infections however most common symptoms include fever on and off with chills, running nose, throat infection, cough, fatigue, in some patients - nausea, vomitings. you said your son has high temperature followed by sweating. this is most common in influenza infections. children have high temperature which drops and then rises again after few hours. symptomatic treatment is preferred in such cases. If i were your treating doctor i would have prescribed antivirals along with paracetamol. If left untreated, it can lead to complications like pneumonia, bronchitis especially in children with low immunity. i would suggest you to consult your pediatrician and start medication immediately. hope my answer helped. wish your son a good health.