question: I have been coughing and sneezing after cleaning houses, dust and cats are my allergies, lately I have been noticing a tightness in my chest when I cough and a metal taste in my mouth only when I cough. This is the second time it has happened.  About three weeks ago I had a back tooth pulled as it was infected, however much better now and no pain and swelling is gone, I wouldnt think it would be that.