DO NOT BLOW YOUR NOSE.
If you blow your nose the infection from nose will enter your ears.
It could be because of infection innose dripping in throat and causing throat pain and coughing.
consult an ENT specialist
so that proper examination of nose is done and if required throat swab can be taken for culture and sensitivity to know the organism and antibiotics which can be used.
you can start with--
500mg once daily for 5 days
tab. Mucinac 600 once daily
Tab. Ebastine/Loratidine +Phenylephereine /pseudoephedrine
nose drops 2 drops both nostril 2 times a day for 5 days only
Physiomer normal saline nasal spray 2 puffs both nostril 2 times a day
500mg sos (if required for pain and fever)
follow up after 5 days.