I have been experiencing a sweet odor in my nose, upon inhalation. My breath smells fine, but when I inhale, I smell this sweet, sort of alcohol smell. I have not been drinking. I have a bit of post-nasal drip and slight congestion due to allergy. I have not been diagnosed with diabetes or any blood sugar issues, at least not since my last physical 10 months ago. The mucus from the back of my throat/post nasal drip also tastes sweet and salty. Any ideas?