a bit more about the TERM-model. here are a few "interesting" quote from the guidelines
(again, sloppily translated -- i actually don't speak danish, but written danish is quite similar to swedish so i can understand most of it reasonably well):
HOW SURE CAN I BE THAT IT'S A FUNCTIONAL DISORDER?
In 75% of the cases where the patients are suffering from more than 6 physical symptoms for women and at least 4 physical symptoms for men, the condition will lack a biomedical explanation.
Consider if new symptoms or a worsening are expressions of emotional communication rather than a new ailment.
HOW BIG IS THE RISK OF DELAYING A DIAGNOSIS OF ANOTHER SERIOUS ILLNESS?
[...] Several studies about persistent physical symptoms suggest that the diagnosis of an organic illness is only delayed in less than 4% of the cases.