I don't know how to deal with loss.
When I lost my father I was sober for some months.
I just got depressed for some years, sober and depressed. Didn't know how to deal.
Then I started drinking/ smoking again, and depression got even worse of course.
As the time went by, did some therapy, learned some things in life, now I'm better.
Best way I know to deal with loss is spiritual beliefs.