Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that your son is suffering from Upper
Respiratory Tract Infection commonly known as
Common cold and all the symptoms of cough with phlegm, fever, fatigue and headache can be due to it and it is commonly a viral infection and there can be secondary bacterial infection along with it..
As it is already 4 days, now you should consult an ENT expert and get evaluated and he can advise him to take antibiotics like
Levofloxacin, for fever and body aches and headache
Tylenol can be given, decongestants can be given to relive congestion and mucolytics to ease in draining mucous..
Steam inhalations, warm saline gargles and using a humidifier in his room can help..
Take ample of rest, take
soft diet, avoid chilled foods.
You can do warm compresses over his chest..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.