I have had breast pain in left side since a cough/cold 2 weeks ago.

Hi, Holly.  I wouldn't worry too much about that, probably strained a muscle when you were coughing, and it should slowly resolve.  Likely, it will just get better with time, and there is not much to do to help it along.  Here are a few things that would warrant eval by a plastic surgeon: new firmness of left breast, change in shape/size of breast, fever, increasing pain, or pain not going away.  Hope this helps.