hello,I have a bad chest cough that just appeared yesterday.  It started with a scratchy throat then quickly became me coughing up yellow phlegm that tastes metallic like iron.  I feel a little fever but my sinuses are clear, only my chest cough.  I dont smoke
You are probably going through a viral infection. Have lots of liquid, try steam inhalation and warm salt water gargling. If fever persists you will need to see your doctor.