Hello there. I have a wierd smell that I've been getting for about a year. No taste tho. I too went to my dr., who had no answer. But my smell is kind of metallic, and rotten at the same time. It can happen anywhere, doesn't matter if I'm outdoors, indoors, air conditioning, or whatever. I've not noticed that it's a signal for anything, like migraines for me. It just comes and goes, and it is overwhelming, and seems like its taking your breath. Hope we can find some answers.