So I finished Dr Mulholland's book and have passed it on. I took 2 key thoughts from it:
The first - as mentioned in the last post - is to worry less. I'm pleased to say that this thought has been working well and I feel a lot better for it.
The second is to remember that everything starts with a thought. A thought triggers an emotional response which in turn triggers an action. Think happy thoughts, feel happy, and behave positively. Think negative thoughts - and well, you can work the rest out.