My fiance has had a persistent sinus infection since early June. He was initially prescribed a 10 day course of antibiotics and experienced some relief before finishing the course and becoming infected anew. He then took a three week script with no relief and is now on another 10 day course. He continues to experience intense sinus pain, excessive, thick nasal discharge and most notably a self-perceived AND noticeable to others, foul odor eminating from nose . It is reminiscent of hospitals or nursing homes. He works in a very dirty environment-a warehouse that tests auto parts, no air conditioning. What could this be?