Here's a book I found in the library but am now tempted to go out and buy my own copy:

How to Stop Worrying and Start Living by Dale Carnegie

This book has destroyed my constant negativity and replaced it with a positive grip on life. Written over 50 years ago, the advice within its pages is absolutely relevant to today’s ‘have it all now!’ society.
Carnegie cites hundreds of examples illustrating how a change of mental attitude will free up energy wasted on worry and produce peace of mind and happiness.
Don’t be put off by the slightly old-fashioned American case studies but concentrate on the little mottos and mantras at the end of each section. They’ve given me a new found confidence to face the world without fear.