According to the symptoms you report, a blocked nose and runny nose, and the X-ray image showing a septal deviation and sinus haziness it seems that you could be experiencing chronic sinusitis. A deviated nasal septum prevents normal mucus drainage from the sinuses. Stagnation of the mucus makes the sinuses vulnerable to infections. And repeated infection can cause chronic inflammation of the sinuses. Additionally, chronic inflammation can cause polyp growth in the nasal cavity or sinuses. A CT-scan can detect such a pseudotumor. The medications you are taking (decongestives, corticosteroids and antihistamines) are successful in calming inflammation. Medication would be prescribed if the chronic inflammation was caused by allergy. In your case, it seems that the deviation of the nasal septum is the main cause for the chronic sinusitis and surgical intervention would be more helpful than medications.