i was in an auto accident a week ago.  After the ER, no broken bones (airbags deployed and I was wearing a seatbelt), I have been having chest pain and sometimes shortness of breath. The past few days, I have been having a hardness of I think the pectoral muscle. I can feel it and it goes from my sternum up towards my shoulder. Should I be worried? Is the hardness normal? It is intense pain and is not improving with ibuprofen or muscle relaxers.