Good Day to All of you!!
Great Topic, I absolutely LOVE to read.
One book I found (and still do find) helpful with my A/P is Coping With Anxiety: 10 simple ways to relieve anxiety, fear, and worry.
It's a smaller book so I often carry it with me when I'm feeling particularly anxious.
As for general reading: I love Anne Lamott. Her books are so wonderful and give a lighter take on some serious issues of life. Some highly recommended books of hers are: Traveling Mercies, Plan B (sequel), and Grace, Eventually