wow this place is great!!! I have found answers to 3 medical questions I had. Big thnx to the contributing docs :)
The twitching is called "myokymia". Its a kind of spasm of your eyelid muscles, usually benign. Most people can stop it temporarily with a warm compress, but it sometimes returns. It is most often caused by lack of sleep, but it sounds like you have other known neurological problems which could be contributing.
I have had some success in my office prescribing topical antihistamines like optivar or patanol to control myokymia.
I just wrote you a note in response to your comment below. As for eye twitching, I've been told it's harmless (and usually stress-related).
Well, stress makes sense!!!!!