Depressed

I am in my late 50's and have suffered from depression for several years. Much of my depression is self inflicted as a gambling problem led to a life of losing time, friends, family, excellent jobs and money. I have stopped the gambling but perhaps too late. I got sick last year and needed an organ transplant which I received recently. A wealthy family member has taken me in temporarily and supports me. I am looking for work but my past scares employers away because of my work history. I have had 30 jobs in 35 years. I have taken anti-depressants and bipolar drugs for years but always with the same result, I lose my ambition. I am almost catatonic and only desire to eat and watch television. I have completely withdrawn socially and live with guilt upon guilt upon guilt for my past life. I am considering committing a crime that would leave me incarcerated so that I am no longer a financial burden to anyone. I know
that will cause me more guilt and depression but I don't know where to turn for help. The supporting family member says that depression can
be cured by learning to cope. I've been trying to cope for 30 years.
Any advice would be appreciated.