I guess I've had a little bit of all of these, but only short/slight. The strongest stabbing stinging pang in both thighs for 3-4h came from (semi-"deliberately") overdosing glutamine. Made me shout in pain a few times and want to rip my legs off. Cold washing or showering helped.
For orientation (altho it may seem too logical): it seems to be our nerves, even if neurologists can't find anything (yet). So that'd mean first looking along the lines of treatments that nurture them, like Carolyn's B-complex or similar supps, or override the sensation like sunkacola's TENS or my cold treatment (Gate Theory of pain). If it feels more muscular praps magnesium.
It also seems pretty feasible that a neurotransmitter like glutamine influences nerve transmission, as the name says, and the antidote to the dopamine increasing amino acids like glutamine, theanine and many more would be everything that increases serotonin, like GABA.
Theoretical background, only for the so inclined:
As researchers (IASP) are terming our "invisibly caused" or cause-less pains c) "nociplastic" as opposed to a) nociceptive (pain due to injury) and b) neuropathic (pain due to nerve injury), is our fibro-version of paresthesia also non-neuropathic? (Assumed a specific form we have isn't a neuropathic form due to a yet to be found nerve injury.) (I think them coining the term/definition 'nociplastic' is premature by the way, as long as research on FM hasn't got anywhere close to causes, it's again a work-in-progress hypothesis.)