It seems that he is suffering from upper respiratory tract
infection causing cough, fever, sore throat and such symptoms in him.
It may be caused by bacterial or viral infection.The bacterial infection are treated with suitable antibiotics like augmentin, ofloxacin, septran, along with antipretics to decrease the temperature.The commonly used antipyretics are crocin, motrin, advil, brufen etc.The honey can also be used in reducing cough.
The decongestants such as pseudoephedrine
(Sudafed) Actifed oral, phenylephrine
(Neo-synephrine nasal) can be used to reduce nasal congestion
You should imeediately consult the doctor nearby you and start the treatment as the uncontrolled fever may cause febrile seizures
to happen in some children.