If your surgeon says the sinus is clear by CT scan and endoscopic exam, it is difficult to know the exact reason for your dull pain. In early postoperative period, patient can feel uncomfortable at the operation site. I think it is wise to wait a little bit more and continue to follow up the...
Although it is normal to have drainage after this procedure, it is always best to return to your doctor who performed your surgery for the best answer. Your doctor knows your specific case and will determine if this is normal or abnormal.