I was recently diagnosed with breast cancer following a biopsy 4 weeks ago. I have been told that this is early stage and they are hopeful that it can be treated with surgery and some radiotherapy.

I have over the last few days developed a cough and some chest pain which I suspect is a chest infection. Am I getting carried away thinking that this could be something more sinister? Should I be rushing to the doctor to be checked? Or should I ride this out like I would have prior to my diagnosis? 

thanks