My 55 Year Old Husband David Is Suffering Terribly From

My 55 year old husband David is suffering terribly from Chronic Pain for the last seven years. It seems to be getting worse. He is still working and is struggling with that. He is exhausted that sometime he sleeps for a couple of days straight. When the pain get out of control he sweats heavily, sleeps, and has no appetite. He is to the point that he cannot take the pain. He is on several meds moraphine and other drugs. One is even for depression.