Jack,
You should see your doctor. You haven't completely described your condition (whether it is your eyeball or the muscles around your eyes), but it could be Blepharospasm. Blepharospasm can present in many different forms. I was lucky enough to be diagnosed with Benign Essential Blepahrospasm a few years ago. It is a neurological disorder, where basically, the brain sends a signal to the eyes to close...all day, every day. When I first noticed it, I started to experience a vibration, or twitch, much like you described. Before it was finally controlled, my eyes had closed completely, and would not open for nearly a year.
For most people, Blepharospasm can be treated with Botox injections in the eyelids to paralyze, or at least weaken, the muscles of the eyelids so that the patient can keep the eyes open. In my case, I am immune to effects of Botox, so other measures had to be employed. There is a surgical procedure to remove a portion of the eyelid muscles, so the patient can overpower the eyelid muscles with conscious thought. That, by the way, causes severe headaches and mental exhaustion, but it's better than being functionally blind, trust me.
You may very well not have this problem at all, but see your doctor ASAP. This affliction started for me in 2001 and it is absolutely miserable. It is a progressive disease, and there is no known cure. Perhaps, if you do have it, jumping on it early, will give you a fighting chance.
By the way, the condition is exacerbated by caffeine, lack of sleep and stress. Just something to keep in mind. Doctors believe that my condition may have begun due to an overload of stress following the events of September 11th.
Good luck to you.
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