How Can Cough And Backache Be Treated?

I ve had cold symptoms for a couple weeks. I thought I was getting better, but still have a cough. The past few days my back has been hurting - mostly muscular, I think. It is noticeable when I cough and take a deep breath. I m still blowing my nose some - mostly clear and I m not really coughing up phlem. My concern is I don t want the cold to go into pneumonia and not know it. I also seem to cough more at night and when I lay down. My back is noticeably painful when I lay on my back.