Autoimmune disorder is a self-destructive disorder. As I have seen in my experience, hereditary or acquired suppressed syphilis and / or gonorrhea are the main causes. This self-destructive problem can also be caused by chronic depression.
I think there are a few misconceptions here. First, autoimmune diseases are not always destructive, and as far as we know, they are not always started by responses to infectious agents, let alone some specific infectious agent. Also, I agree with Vivek in the sense that depression is more likely a consequence than a cause of autoimmunity and inflammation.