I've had all of the types and locations of twitching [especially heavy in feet and calves], along with periodic [and temporary] numbness and tingling, and occasional light cramps in legs or arms. Also episodes of fatigue. However, the only pain I've experienced has been localized in my feet after doing a regular four mile walk, or standing all day at a volunteer center where I work. However, this pain is more than that which used to accompany those same activities before I started having the twitching. It seems to me that if BFS is a "hyperexcitability of the neuro muscular system" it could be making the nerves and muscles in the feet more sensitive to the repetitive pounding of the walking activity.
I've read of "pain" with some of you, and am wondering how it presents itself, to see whether the foot pain I've had may be similar.
When I describe all of these symptoms to my neuro [who looks about 20 years old and doesn't speak very clear English], she looks at me like I'm the only one who has ever told her about similar ones.