I would suggest that if you are relieved by taking steam inhalations, no medicines need to be started. Allergic rhinitis causing this kind of issues are very common and not life threatening. If you are not very relieved with steam, start with Tab Histafree-M twice a day and Allegra Duo Nasal Spray two puffs twice a day for 7 days whenever you get your episode of nasal complaints. For headache, add Tab Paracip 650mg if pain is there. Use of Xylometazoline and Oxymetazoline popularly sold by the brand name Otrivin and Orinase nasal drops is STRONGLY DISCOURAGED as they may lead to major complications on long term use. Follow up SOS with me if complaints persist. A CT scan may be required but can be only concluded after detailed history taking.