I have been diagnosed with depression for more then 20 years. The first 15 years consisted of a lot intense sadness.
Now I function reasonably "normal". I live alone and have a part time job.
Its just so hard to do all these things and resposibilities of daily life. 
Because I just dont have any inner drive or desire to do anything. I have to force myself very hard to do the smallest thing.
I have been in therapy for 20 years, the last 10 years in psychodynamic therapy. I take high dosis of SSRI.
But these things just dont make a difference anymore.

Any suggestions what I can do to become a living being again?

My doctor/psychodynamic therapist is so convinced of his own theory that he doesnt suggest anything else beside it.

Thankful for any suggestion