I've now clicked on the above links and read it all carefully.
The problem is that I don't have any faith in being able to control my pain by adapting my mind/thinking is some way.
I bought a book a couple of years ago by an American, the founder of a pain psychology centre, and although I have studied it deeply and tried very hard to work at the system described, it has not helped, and the pain has not been relieved in any way whatsoever. I've read this book three times and it simply doesn't work for me. So I am a bit cynical about all this.
But I am grateful to Applegran for being kind enough to try and help those of us in chronic pain.