I am having the same exact thing happen to me. I can recall smelling metal when I was in elementary school as I walked down my street to school every day. The fence along the perimeter of the feild was metal but it wasn't rusty or old. It smelt so strong and so bad that I had to hold my breath and I complained about it multiple times to my mom. She never experienced smelling the metal herself. Ever since then (I'm 25 now), I've gone through short periods of time where I smell metal so heavily, and no one else knows what I'm talking about. Google hasn't helped me much either.. A lot of the articles say, "You probably just touched metal recently". I swear that's not the case. Anyway, my hands have been smelling like metal for a month now and it's freaking me out.