All "buzzing" is, is a fast, weak twitch. BFS has twitches in every size, shape, speed, duration and so on, from big, one time thumpers, to little 2 - 3 second twitches, to tremors and twitches that can stay in one spot for hours, weeks and even months on end with no stopping, and of course, there are little teeny one's that have very fast "frequencies", yet are very weak, so they feel like a "vibration" or a buzzing feeling, but it's just a different form of a twitch. Some are so small that you can feel them but not see them. It's a very common symptom of BFS, so don;t worry about it. The buzzing will come and go just like any & every other kind of twitches you get as well.