Given the history of trauma and worsening, incapacitating symptoms, a serious cause of the pain, such as a fracture
compression, disk bulging, etc has to be ruled out as you have failed conservative managament. The best way to assess these by imaging would be through an MRI
, and I would encourage you to see a specialist in the subject, namely an orthopedist or neurosurgeon with back specialty for further work up.
Dr Brenes-Salazar MD
Mayo Clinic MN