Reading and researching causes /andor controls for fibro, one thing is clear is most fibro suffers share certain symptoms but we all have our own added extras and personal ways of trying to cope.
A big coping mechanism is how well we can convince ourselves that the latest treatment is the one that will work (Hopefully I will remember the medical term before I finish this). I don't believe that fibro is 'all in the mind,' but it definitely has a powerful influence on how well we can cope - at least in the short term.
I have done judo for 30 years - so teaching now rather than doing (it is what makes me get up and keep going). I know that if I just try a technique it will hurt me more than my partner, but if I take a few seconds to 'shut the feelings of pain/resistence in a box' then i can easily do more or less any technique I want without feeling any pain, I can throw or be thrown without shoulders or legs breaking (my normal state is shoulders really solid, my mind says tense is good it is protective as even the wind blowing on them will make them shatter). I will feel great (even euphoric) for a few minutes then the old familiar pains return - no worse than before but the brain refuses to be convinced that I won't fall apart if it just allows my body to relax and get on with life.
Ah yes, placebo is the word, but if it works even for a short while (and can't do more harm) then isn't it worth it. Problem is medical ethics says treatments have to have a provable record of curing to be prescribable (yes I know it is not a word)