Allergic rhinitis is the most likely cause of your long-term symptoms (15 years of sneezing, runny nose when you go outside, and seasonal worsening). Allergies can also occasionally cause coughing, throat irritation, and moderate fever-like discomfort during infections or flare-ups. Doctors frequently employ antihistamines like cetirizine or levocetirizine to lessen sneezing and runny nose, as well as daily anti-allergy medications like Montelukast, for long-term control. For seasonal flare-ups and chronic blockage, nasal steroid sprays (given by a physician) are frequently the most helpful. It's crucial to inhale steam, use saline nasal rinses, and stay away from smoke, dust, fragrances, and cold air. Another way to lessen symptoms is to wear a mask outside. You should consult an ENT or allergy expert for a thorough evaluation because your symptoms are chronic and get worse with the seasons.