I got a lot out of a book called "The Grief Recovery Program." It took me a bit to get there. Know that there is often face to face groups that work this book and a number of my fellow Al-Anon group member took that and got even more out of it.
Also earlier in my healing I read a book by Anderson (Susan I think is the first name) called The Journey from Abandonment to Healing which helped me to understand the biochemistry going on in my body that kept some of the emotions coursing through me. It was really helpful to understand that I was not by myself in this.
Kind thoughts your way.