I too was convinced that the smell was coming from my nose
. Because of this, i ended up at an ENT, who convinced me I needed surgery
on my sinuses & tonsils. Well, after having tonsils\adenoids removed, upper gi, lower colon splenoid or something done, and all kinds of other medical test ran. The culprit turned out to be a crown on the lower left molar tooth. The tooth up under the crown had split in half, and the damn thing became infected or something.