chronic pain
"This is the second time I have been on Methadone for chronic back pain.  I weened myself off Methadone a couple years ago.  My condition has worsened and pain doctor's don't like to prescribe narcotics anymore.  I was in so much pain, and was on the verge of suicide, so my primary doctor called my pain doctor and asked him to prescribe Methadone.  This has been a lifesaver. Still in pain, but can function now."