hi, thank-you for providing the brief history of you a thorough musculoskeletal assessment is advised. As you had a fall and had rib pain which was healed which all of a sudden started back. let me make little deep understanding about it. Rib bone is a flat bone and any hairline fracture occuring in that will heal and stop the pain. But sneezing is a high intensified process which will lead to abundant pressure on the rib and the weaker part may get damage again. Also, you need to do some costal breathing exercises as it is the only way to strengthen the internal costal muscles which supports the ribs. If strengthening exercises were done post healing of the fracture than the bones will become stronger and well supported by the muscles as well. Also, performing now will help to regain the strength in the intercostal muscles so the support to the respiratory cage is strong and can withstand future injuries. in our clinical practice post injury to the ribs the breathing exercises are taught properly to strengthen the muscles of the intercostal space and maximum benefits are achieved. Regards Jay Indravadan Patel