Hey, SDJaq. Any muscle can twitch, I think you've gathered that much by now, right.

The tongue, the eyes, calves, thighs, lips, noses, necks, prostates (I'm not kidding), etc. Twitching often takes place predominantly in one spot, it is called a hot-spot. The length of time they last can vary, but I have had them for months. No biggie. In fact, before I ever got bfs, or thought that I might have bfs, I got a persistent eye twitch that lasted some 5 or 6 months. I didn't have a computer then, so when it went away, I didn't look for it to return. So, what you are experiencing is common garden variety bfs, not anything so exotic as a sinister disease.
Now that you are well, and have been proclaimed so by me, Basso, I will now tell you the remedy for bfs, or anything for that matter. Boinking. Yes, that is right.

At 21 you should be thinking about playing, grabbing the world by it's tail and swinging it, and boinking your brains out. Just remember to use a condom, be romantic (it won't be a good as when you are in your forties, but it will set you on the right path), and laugh. Run through sprinklers, go to movies in the afternoon, and lie on your back staring at clouds.
Your bfs is going to go away completely anyway, because you are so young. That is what happens at your age, the fascics disappear. When that happens though, don't become some uptight di*ckwad, in search of money and possessions. Remember how bfs touched your soul, and let that guide you towards your obviously, very bright future.
Basso