One of Al Anon's books is called Opening Our Hearts, Transforming our Losses. It deals with grief - and it covers all kinds of grieving: loss of a job, loss of a relationship due to alcohol, death of a sponsor etc etc. It is really thought provoking and helpful.
I bought it when I was ending a relationship and wanted to know about grieving a relationship, and now I am reading thru it again since my mom recently died.
Big hugs
Cats