Inflammation & edema 11 months post septorhinoplasty & turbinectomy, ideas?

Hi, During the first three months, I felt awesome, but later I started waking up with constant runny nose, which worsened over time, adding issues like congestion and breathing issues, 2 months with Flonase gave temporarily relief. An endoscopic exam revealed inflammation and edema. CT scan: Extra large opening in the left maxillary sinus causing recirculation. ENT has offered ESS, He believes my symptoms are due to the recirculation which causing chronic allergy rhinitis(dust mite). Ideas?:)