Hi Cappi,
Oh my, what a stressful and heartbreaking life you have lived. I hope you are healing now.
It is interesting you mention the crossover between N and addict. My H is probably not NPD, but he does have N traits. And, he does have an addictive personality. My H's addictions are mostly soft... internet, video games, tv.... But there is alcaholism in his family. If he has a drink a few nights in a row, the first night that he doesn't, he can sense that he wants it. He is aware of this and tries to keep it in check. But I know there is potential for him to head down some dangerous paths.
This is my observation. I think Narcissism and Addicition have something in common. They are both about self-deception. both are in a great deal of denial. N and A do not know who they are, and are afraid to find out. N and A are afraid of intimacy with another person. Addiction is a coping mechanism for N. Addiction is a false sense of connectedness and security, and it is a way of avoiding the truth, intimacy, or what have you.
Peace to you Cappi as you continue to navigate the road to healing!