I think a general problem with diagnosis is the fact that our symptoms shift over time. At a specific time if you look at my symptoms, I may well not qualify for ME if the definition is rigid. However over time I would. Doctors often focus on what's wrong with you NOW, and have difficulty with the long, complicated history. Therefore, distinguishing too much between ME and CFS is potentially dangerous. Instead I think it should be seen as a SPECTRUM disorder, where people move up and down the scale, and have different subtypes, but in general need to be looked at as a single, complex group for some purposes, if not all. Does this make any sense?