A problem with trying to take evidence from people who have improved from one level of ME to a higher level (very severe to severe, or severe to moderate) is that many patients telling their stories attribute their improvement to whatever new thing they were trying at around the time they noticed an improvement, whether it was a dietary change, or meditation or yoga or homeopathy or sleep hygiene or resting more or increasing activity.
There's no way of knowing whether these factors were coincidence or that they had only managed to make those changes because they were improving naturally anyway, not vice versa. There are so many factors of daily living that teasing out whether any of them is relevant seems impossible. I'm just trying to imagine the length and detail of questionnaire you would need!
Which, of course, is why it has to come down to clinical trials. But the question is, what management strategies are worth trying in such trials. And how many severely affected patients are in a position to be able to implement, or even try to implement different management strategies when many don't have access to the support systems that would enable them to participate.
For example, one I've seen mentioned several times on forums is 'aggressive rest therapy' where, as I understand it, all you do is remove all stimuli, rest, sleep, eat and go to the loo. In theory I'd give that a go, but in practice it's totally impractical in my life situation, and I'd go bonkers with boredom.
I've even wondered whether putting people in an induced coma for a while might help, but that's probably a bit extreme!