You have real and significant pain that is affecting your life. You want to have pain relief. How is this crying wolf?
The purpose of your doctor is to determine what your pain origins are and try to solve the problem. Once he discovers that you have a pars fracture and now has a potential pain generator, he can order a selective nerve root block to temporary anesthetize the nerve in the L4-5 foramen. If you gain good temporary pain relief, he can potentially plan a surgery that relieves your pain.