pulsating eye

i think i'm going crazy.. this pulsating right eye problem has been hitting me through the days n nights for the past week. no pain.. just bloody annoying.. spastic twitching of the bottom eyelids..

Possible problems...
1 lack of sleep
2 depression
3 stress
4 medical concerns
5 too much caffeine
6 being on the computer for too long
7 eyestrain - keeping your eyes focused at the same distance for long periods of time or working under bright lights or in areas of very high contrast and changing focus often.

i have had a dose of caffeine every now n then.. green tea seems to be the main problem under my speculation.
ohh well.. time to stop the green tea for a bit n see what happens..