About a year ago, my then one year old son head butted me right in the nose. After this, I have stayed mildly congested, generally in the mornings. This May, I developed a fairly severe sinus infection that lasted about three weeks. In June 2008, the same head-butting thing happened again - except it was more of just a tap to my nose this time. I immediately started smelling a constant smell of ammonia. During this time I could smell NOTHING (not even the shampoo in my hair) but the ammonia. About a week later, the ammonia smell dwindled away but I am left with a strong smell of cooking oil. It is particularly strong in my urine and in greasy foods like hamburgers, etc. Sometimes I can taste it in my mouth. I don't eat oily foods very often - in fact I don't cook at home with oil at all. Also, on occasion, i will get a very sweet sugary taste in my mouth that only lasts for a few seconds. I still wake up with slight congestion that goes away mid-morning. What could this be?