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This is Dr. Bonilla. I understand your concerns.
Chronic sinusitis could be a difficult problem to treat. You can see an allergist or pulmonologist and be tested for other causes of sinusitis including allergies, viral and bacterial. A culture and CT scan of the head may be necessary to determine the cause. A prolong treatment with antibiotics ( 6-8 weeks) may be necessary. Let me know if oyu have any other questions.