Hello, You must consult an ENT specialist for examination and getting a CT scan of nose and paranasal sinuses . By seeing the scan it deduced that what is the extent of the disease and what needs to be done next. YOu might need antibiotics and decongestants and nasal sprays both saline and steropiod sprays . If required surgery will need to be done depending on the CT scan finding . This discharge is because of the nasal secretions to some allergens or dust and the secretions drip down the throat and cause irritation . In doubt do reply