I'm 23 and have chronic sinusitis. Recently took CT scan and report is shown as MUCOSAL THICKENING IN BILATERAL ETHMOID, MAXILLARY AND SPHENOID SINUS. AND DEVIATED NASAL SEPTUM. My doctor going to perform FESS Surgery and Septoplasty next week . Is FESS procedure safe? I saw some sites says it has serious complication because of brain and eyes. I am scared.