Dr. Tennant has done and written about some great (some groundbreaking) stuff, but as he himself notes, pain endocrinology is "early in what is clearly an emerging practice". It, or something very similar, has been hyped in 'pop alternative medicine' for some time as adrenal fatigue/exhaustion. Either way, it's not yet recognized by mainstream medicine. Your doctors may raise an eyebrow.

I've been following some of his recommendations for some time, chronicling it here, with what have been for me, great results.

Doc