Has anyone ever hallucinated smells as a part of their anxiety? 

This has never happened to me before but my anxiety is at an all time high, and this morning I smelled a strong vomit smell coming from my roommates bathroom, but when I asked, nobody else could smell it and nobody had been sick. I then smelled it again in the living room, and it would just come and go. But again, nobody else could smell it. Then I tried to smell the bathroom again and the smell was gone. 

Am I hallucinating?