Hello and welcome, Thanks for your query. I understand your frustration, and shall try to put forward another possibility. Halitosis: is bad odor or breath which is exhaled during breathing. This bad odor can come from: -Mouth -Nose -Gums -Tongue -Esophagus -Stomach Let me not go into the details of other parts and stick to the nose, which is what you want to know. The most common causes of this exhaling nose odor could be: -Sinus infections -Foreign body Diagnosis: Halimeter or gas chromatography Please discuss the possibility of a foreign object in your nose that could be causing this or request you doctor to look into other possible cause. I hope I have succeeded in answering your questions, you could write back to us anytime for further clarifications. Best wishes.