Madison, Codependent No More is one book that has helped many of us here, also The Language of Letting Go, a book of daily readings that continues to inspire me today. Both books are by Melody Beattie, a terrific author who writes like she is one of us...because she is.
I am glad you have found a good meeting, the ones I attended were all about "us" and nothing to do with our addicted loved ones. They were about healing and healthy behaviour and setting boundaries and learning to live well again...regardless of how our loved ones were doing. The 12 Steps still guide me in my life today, they are a really good "living plan" that helps me stay on a good path.
Hugs