Drink.
A lot.
It may not stop twitching, but at least you won't care.
I've had that happen but not for that long. I seem to get it in my left eyelid a lot.....I remember seeing something somewhere at sometime (how many somes can I fit in a sentence?) that was talking of something that affected muscle twitching, like it was caused by some deficiency or something.....I can't remember what it was, though. Maybe sleep.....or some vitamin.
Good luck......
b