Simply DO NOT GIVE UP! No matter how "great" the doctor's reputation, credentails or his seeming sympathy for your pain, IF you do not get reasonable, relatively appropriate and expeditious answers resulting in treatment that is effective for your pain, GO ELSEWHERE. Do not let yourself be intimidated by a doctor's assertions (on his failure to diagnose or successfully treat your pain) that the PAIN is somehow your fault, all in your mind, or some manifestation of a neurosis, or some personality disorder, again all of your conscious or unconscious control. LIFE is short, every moment filled with promise and happiness -- let nothing stand in your way to participate in the joy and realization of this fleeting blessing.