from what I read the NHS prefers to use the term CFS.
You are right, of course, but the NHS guidelines are very out of date, and many ME specialists as well as patients are campaigning to get it changed - the International Consensus Criteria call for the term CFS to be dropped in reference to ME as it's so inaccurate and confusing. I generally (politely) correct anyone who refers to mine as CFS and explain that the criteria for CFS are completely different, and have found that they do take it more seriously as a result. I'm thinking diabetes specialists who know nothing about it here, though, not ME specialists who are just used to the old terminology and already take it seriously.
From what you've said in other posts as well as that one, Amanda, it's clear that what you have is ME, whatever they call it
I have met people who had CFS rather than ME, and they were much less ill, and tended to recover quite quickly (within a year or two of diagnosis).
I've found most ME specialists, as well as some of the ME charities, tend to talk about ME/CFS - when chatting with the doctor at the ME clinic I attended (whom I knew outside of the clinic already because he'd spoken at the ME group I helped run), he said that if they did not see people with CFS as well as people with ME, then no-one else would, and they were ill and needed help too, which is perfectly reasonable. Our ME group also welcomed people with CFS, PVFS, and Fibromyalgia.