Firstly you need to get a nasal endoscopy done by ent surgeon, also a CT scan of nose and sinuses would help to confirm the sinus issues the severity that will help in deciding if there is a need of surgery. You can start doing steam inhalation twice a day for a week.continue nasal decongestant drop two drops thrice a day for a week and stop, don't over use them. Take tab mucolite SR once a day for 5 days . Take tab levofloxacin 500mg twice a day got 5days.tab montek-LC once in night for 7 days.