I'm sorry to hear that he suffers from recurrent infection.
With ear dischage and pus draining from the ear - he needs to have antibiotics course to control the current infection. For pain- he needs pain killers like Paracetamol
, along with anti-allergic medicines like Cetirizine
Has he seen a doctor recently?
As he suffers from recurrent problem with this ear and sinuses, he needs to get checked over by an ENT doctor. He may benefit from grommet insertion.
Wishing him a quick recovery
Dr Tejas Shah