You seem to have had recurrent nasal polyposis. What kind of surgery did you undergo? A Functional endoscopic sinus surgery
(FESS) would be ideal for you. During this procedure, the polyps will be visualised properly and removed to maximum extent using endoscopes; of course you need to be aware of the complications of the procedure too. Speak to your doctor and know more. Post surgery you may have to use nasal sprays and other medication to prevent recurrence.