I have a sharp pain when i breath in deeply on my left side(diaphragm/rib pain). any idea what this may be??

See your doctor: Pleurisy, musculoskeletal. Have your doctor exclude more serious things such as problems with spleen, kidney, distal pancreas, colon. Also exclude pneumonia, pneumothorax, pulmonary embolism. This is a very common complaint. A thorough history and physical, perhaps a chest x-ray, should get to the bottom of it. Keep track of any fevers, cough, shortness of breath, bowel or urinary symptoms.