Hi welcome to health care magic.... You might have chronic sinusitis infection.... The decongestant and antibiotic is correct treatment for it... But here your paranasal sinus x ray has to be done to rule out it... If chronic sinusitis with reactive changes and if needed than functional endoscopic sinus surgery might needed... Otoscopy examination also needed for rule out infective condition.... Steam inhalation done three times a day.. Avoid excess spicy foods and one tsp turmeric powder with milk taken daily .. Advise : Consult otorhinolaryngologist for examination and further work up...