Hi JackJohnson,
You ask a great question, and Dorado's post addresses some of the thinking and strategies around this. As he has written, when it comes to fibromyalgia, the TMS community generally believes, I think, that all fibromyalgia is a form of TMS, and therefor TMS treatment is the best, and possibly only treatment which actually gets to the cause.
With some conditions like fibromyalgia and Lyme disease there can be an initial ailment which, after successful treatment kicks off long-term symptoms which are mind-body. Sort of like a whiplash injury.
Most other ailments, from the TMS perspective are relatively easy to divide into those treatable, and those not treatable as mind-body, once serious systemic or structural issues have been ruled out.
Even if doctors can't find an explanation for the symptoms and one thinks that TMS could be a likely explanation, one can never be 100% sure. Given that acceptance of the diagnosis is essential, this seems to me somewhat problematic.
Going to a TMS physician is very helpful to get close to %100 sure. Without this help, other forms of TMS practitioners can also help, as well as case studies for instance in the TMS Wiki or the Success Stories.
The truth is that there may always remain some small doubt, even with successful treatment. Doubt goes away as the treatment works. So you can treat as mind-body, and learn to watch symptom response to stressors, triggers, emotions, etc to "build a case" as you go along. I hope no one lets perfect acceptance stand in their way!
You are right. It is not perfect. But for those of us in the TMS community, experience shows that most cases of conditions listed on TMS and TMS equivalent lists almost always turn out (after eliminating serious conditions) to be mind-body "conditions." Mind-body symptoms are extremely prevalent, and not understood to be so by most physicians, chiropractors, osteopaths, herbalists, Chinese medicine specialists, naturopaths, physical therapists, etc. There is an epidemic of mind-body ailments, as has been said before.
Disclosure: And not all conditions are mind-body!
Andy B