Hi, I have a white tongue, particularly from middle to back. Also, have had the flu and virus that turned into a bacterial infection (Green Mucus) and was prescribed a Z-pack for it. THat was a month ago, and I have the white tongue plus heaviness in my upper chest with phlegm and constant tiredness despite plenty of rest. I have never felt well - and I m a generally healthy person. Should I head to the doctor again? Thank you, Gail