My progression has been sort of in the middle of the spectrum. It's been about a year, and my progression went from stiffness and twitching in the legs to twitching all over and cramping in arms and legs, to burning feet, some mild stabbing pains in various areas, and some of the cold/wet feelings, buzzing, electric shocks, and many of the other symptoms people have described. Fortunately, my symptoms have so far been fairly mild compared to what some others have described. I'm still working full time and leading a fairly active life, but have had to cut back on some strenuous activities.

Over the past few months, progression has seemed to slow down. Not sure if it's because of supplements and dietary improvements or not.

And yes, I do occasionally get a numb/tingling sensation in my tongue, but not very often and usually only for a short period of time.