Please meet an Allergist and undergo Skin Prick Tests to identify the underlying allergens that have caused the allergy. Then you must opt for Immunotherapy as that is the only permanent remedy for Sinonasal Polyposis. This however may take up to 5 years, so in the meanwhile continue using Intranasal Corticosteroid Sprays to manage the problem. It is also helpful to do saline nasal washes twice daily about 5-10minutes before using the sprays, to reduce the allergen load in the nose and to provide a clean mucosal surface for better penetration of the spray medication.