Back of throat, roof of mouth, lips and upper lip taste like metallic chemicals. ears bad aching pressure and sinus pain no congestion though? why?

Sinusitis: Problems in the sinuses or nasal passageways can affect your sense of smell and taste. Conditions such as sinusitis, acute or chronic sinus infections, enlarged turbinates, deviated septum and ear infection can cause a metallic taste in your mouth. Usually treated with antibiotics, anti-allergies meds, or by surgery. Once you fix the sinuses, the metallic taste should go away. See your doctor.