Hi, 4 weeks ago I started having problems breathing and was coughing a bit like asthma but my puffer didn t work, I went to the doc she Chechens and said I was just sick and would be fine. It went away for a week and then came back I was also coughing up some mucus in the morning, I saw the doctor again and he has given me antibiotics and said it is bronchitis since then, 2 days, it has turned in to the flu also with yellow snot, fever, body aces etc, this morning now I have woke up and my lower back is hurting also, I think it is my kidneys, is this normal? Or could the back pain be from all the coughing? It particularly hurts when I cough or blow my nose.