Suggest Treatment For Foul Odor Coming From Nose

I am a 42 yr old health professional. I have struggled with bad breath and dry mouth my entire life. I am missing both submandibular glands and I have a hx of mumps as a child. As far as I know, the glands never functioned. I got so depressed in college about my halitosis, I elected to get my tonsils out. Unfortunately, a few months later I developed an odor from my nose. Now 20 yrs later, not only do I have bad breath, I also have a nose odor. The odor is strongest when I eat or when it is humid. I brush and scrape my tongue and I gargle. My breath has gotten better but not the nose. I cannot smell it but people around me say it smells like someone passed gas. How embarrassing. Please, help!