Was x-ray or MRI done on your spine to determine the possible cause of your recurring back pain? It could be a sign that you might be developing herniated disc or you might have scoliosis that is why the effect of the DORN therapy didn't last. If that is the case, then one session is not enough. The Dorn therapist will teach you self-help exercises that you can do daily to relieve the pain & to facilitate the healing of your spine. In my experince as a Dorn therapist, back pains that are caused by spine misalignment usually(but not always the case)takes 1 session to treat and another session to make sure there are no more misalignment.