Septoplasty and Nasal Abscess

A month ago I had septoplasty, turbinate reduction and polyp removal. An abscess developed with painful swelling at the left nostril's base. The doc thinks I reacted badly to the sutures running through the septum (right - left nostril). He tried a drain which fell out after 4 or 5 hours. Then he removed the original stitching and replaced it with new, wire-like stitches which he says are absorbable. Each time required multiple local anesthetic injections to the upper lip and base of the nose which, frankly, were worse than the actual surgery. He prescribed a course of an augmented amoxicillin. I just took my last one this morning and am scheduled to see him later today. My fear is, now that I've exhausted the antibiotic, the infection - which has subsided but not completely disappeared - will come roaring back. At this time, I'm still pusy at both sides of the septum - especially the left as the thing seems to be draining from right to left. Furthermore,  I  don't think I can take yet another set of injections into my upper lip. I was in a quasi-state of shock after the last episode. My question: How long does something  like this normally take to clear up?