We miss you HaRRo! I'm so sorry to hear about your health probs. Two books that I think would help are Meditation, and Concetration by Mouni Sadhu. The Meditation book has great exercises, like one where you look at stuff in front of you then close your eyes and try to re-create the view. That's simplified, but the routines in that book are incredible for relaxation. They go from simple sitting-in-a-room stuff to more challenging riding-on-a-train meditations. Wonderful text that helps you get over humps and let loose of anxieties.
I used to have horrible abdominal spasms when I was stressed, spastic colon runs in my family. 20 years ago I found those books and I credit them with curing my spastic colon.