Hi welcome to health care magic forum,
Your information is incomplete to give an opinion. But still I will try my best.
may be allergic rhinosinusitis presents with nose block , sneezing
and watery nasal discharge.
Other type bacterial sinusitis presents with nose block, purulent or mucopurulent nasal discharge with or without postnasal drip.
For a proper diagnosis you need to undergo a thorough ENT checkup with X- PNS, Diagnostic nasal endoscopy
with or without CT scan PNS to know exact level of obstruction and envolvement of different sinuses.
If it is purely allergic no need of surgical treatment
only medication will help you.
If infective and or obstructive pathology is there than surgical intervention in terms of FESS or Endoscopic surgery