A damp wall in the house, carpets, and ACs are all potential sources of mold. Please consult an allergy
specialist. You may need to take the allergy
test. Chronic sinusitis can also be due to EBV infection.
The other possibility is deviated nasal septum. Nasal polyps and tumors, worms in stool causing high eosinophil counts, gastric reflux are the other causes.
The treatment will be complete only on removing the cause.