Re: Why do I keep on smelling a foul smell that isn't even there?
I could smell cigarette smoke in our house always where no one smoked and where the doors and windows were closed so it ruled out anyone smoking outside. It was really weird, and then one day it stopped! I still don't know how it started! But anyway.... Could it be that you have an infection in your sinuses, sometimes you can smell something horrible and it is just the buildup of the infection. I've had this before, and although it smells pretty bad, it doesn't smell like you are describing. Other than that I am afraid I can't really help.
I think if you had nerve damage in your nose affecting smell you would have had some explanation as to why that happened - ie obvious and ongoing damage to the nasal membranes etc.
Good luck and I hope you find out what is happening soon.