It is difficult to be sure about your son's illness without being able to see him. However your description of his symptoms strongly suggest that he has a persistent nasal allergy problem known as allergic rhinitis. In addition his cough is likely to be due to asthma. He should be seen by a paediatrician with experience in paediatric allergy as soon as possible. Continue to use the Sterimar in his nose while you are waiting for the appointment with the paediatrician to come up.
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