Lae - I was diagnosed with CFS in an NHS CFS clinic. It was the only terminology they would consider valid. Since then, I have been diagnosed with ME, by doctors who specialise in ME - but also protomyxzoa, blastocytosis, KPU, genetic defects around methylation and processing biotoxins, and sundry other conditions. ~I had a genetic kidney disorder to start with, and had also had Hep C. The more you investigate, the more you find. My point in listing all that stuff is that ultimately the names are only important in that they can point you in the right direction. Dont get hung up on them. Dont fret about doing it right - because one persons right is anothers wrong - anxiety about what to do next is a primary feature exacerbating many people's ME, because they constantly feel gnawing anxiety, and that does no ones brain chemistry any good. Trust yourself, trust your instincts - and dont worry about the label.