The pain you describe sounds very much like pain of the chest wall that includes the ribs, muscles, cartilage, intercostal ligaments and nerves. That is it does not sound like pain from the pleura, lung or any of the underlying organs.
The new class of drugs was known as beta-lactamase inhibitors and they worked to block the ability of the S. aureus bacteria to destroy the distinctive penicillin ring structure. The new combination drugs that are effective against Staphylococcus aureus infections are amoxicillin/clauvulante, ampicillin/sublactam, piperacillin/tazobactam and ticarcillin/clavulanate.
2 Staph bacteria have developed a resistance to penicillin-related antibiotics, including methicillin-these resistant bacteria are called methicillin-resistant staphylococcus aureus, or MRSA.  Staphylococcus aureus  (S. aureus) refers to an often harmful bacterium, commonly found in the nose and skin of humans.