It sounds like you are experiencing 'rebound congestion,' a common issue where overusing fast-acting decongestant drops actually worsens blockage over time. For safe, long-term relief, the first step is to gradually stop those temporary drops. Excellent long-term pharmaceutical options include daily intranasal steroid sprays (such as fluticasone or budesonide) and regular saline nasal rinses to safely reduce inflammation. Since this has lasted for two years, I highly recommend consulting an Ear, Nose, and Throat (ENT) specialist. They can evaluate you for underlying issues like allergies, a deviated septum, or nasal polyps, which may require specific medical or minor surgical treatments for a permanent solution.