Coughing up yellow phlegm , sore throat feels like its burning?

You have an infection. The yellow phlegm is a sign of infection. Your throat feels like it's burning because of the post nasal drip, and from coughing so much. Also, your neck is sore and your ribs are sore because you use a lot of muscle when you cough. The coughing is what's causing your neck and ribs to be sore. You probably need to go see the doctor and get checked and you may be prescribed an antibiotic. Feel better soon. :-)