Below are various books that are useful for those suffering from illnesses such as chronic fatigue syndrome, fibromyalgia, digestive disorders, heart problems and numerous others. I have personally found these books to be useful. The books I most highly recommend are From Fatigued to Fantastic by Dr. Jacob Teitelbaum M.D. and for the science behind multisystem illnesses, Explaining "Unexplained Illnesses," by Martin L. Pall of Washington State University.