Does anyone have experience with Dr Sarno's healing back pain methods?

My husband has had intense back pain for two years . He has had a whole bunch of tests done and the Doctors haven’t found any thing wrong..they say it is muscular pain. He has tried every thing to get some relief and is on a crazy concoction of narcotics and muscle relaxers. Recently I was told about Dr John Sarno book healing back pain. My question is is any one familiar with Dr Sarnos TMS treatment. Also thoughts on the mind body connection .