I had the strange smell of Marlboro cigarettes in my nose when I was in my 20's and the GP put it down to stress. I thought he was just fobbing me off but it was. In the last year, I had tests for an autoimmune condition because I couldn't taste things and had big red patches break out on my eyelids. The tests showed nothing and Dr's were baffled. However, my Mum went into a home and the weight of looking after her lifted from my shoulders. Within a short time, the red patches disappeared and my taste came back. I am convinced it was stress.