All these symptoms suggest that your child might be suffering from upper respiratory tract
infection(most probably viral infection)
There is a connecting tract (known as Eustachian tube) between the nasopharynx
& middle ear through which infection can spread to ear.
Also obstruction to this Eustachian tube can lead to ear pain
by un-equalisation of pressure between the nasopharynx & middle ear.
The management consists of:
1. Drinking of warm fluids to reduce throat pain
2. Antihistamines to provide symptomatic relief from cold & cough
3. Nasal decongestants to relieve ET tube obstruction.
4. Analgesics to take care of pain & fever(if any)
So...it will be better to consult the pediatrician
& start treatment.
Wishing your son a speedy recovery.
Thanks & take care.