Hello, Welcome to HCM, I went through your history and symptoms and understand your concern, Were I am your treating doctor, looking at your symptom severity, I would suggest you intranasal corticosteroid sprays for 1-2 weeks and montelukast for 2-4 weeks. Once your symptoms are well controlled, I would change over to montelukast and levocetirizine. Apart from above, I would also suggest you daily nasal saline sprays 3-4 times. I would also suggest you regular breathing exercises and nutritive diet rich in vitamins and minerals with adequate warm fluids. Please avoid exposure to smoke, dusts and air-pollution as much as possible. For diagnosis of allergy, I would suggest you to consult an Allergist-Immunologist who will perform allergy testing and suggest avoidance measures and allergen specific immunotherapy. Thank you.