I have HD, and all four limbs, but mostly my arms, are constantly pulsing and burning, in the muscles and especially from the joint areas, like they are ready to jump out of their sockets (and sometimes they do). This is especially true at the end of the day. Oddly enough, I do get some relief from massaging my own muscles in certain places until they are truly sore (and I drink a lot of water afterward to flush my body of any toxins that are released). It does help.
The only way I can describe the feeling is that it's like the dull pain of an adrenaline rush - like a buildup and storage of unwanted energy that makes my limbs primed, burning, revved and ready to leap out, lash out with incredible force. Not quite as sharp as adrenaline (which is felt in the heart and throughout the body), and no emotions involved, but similar, and quite incessant.
