All these symptoms suggest that your child might be suffering from upper respiratory tract
infection(most probably viral infection)
The management consists of:
1. Drinking of warm fluids to reduce throat pain
2. Antihistamines to provide symptomatic relief from cold
3. Analgesics to take care of headache & fever(if any)
So...it will be better to consult the pediatrician
& start treatment.
Wishing your son a speedy recovery.
Thanks & take care.