the bottom lid of my left eye constantly flutters.?!

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Not a sign of anything serious at all. Just a nerve tic.
It's just a tiny nerve spazzing, telling the tiny eyelid muscle to contract over and over. It usually stops on it's own as the body always seeks to repair itself. I've had them before, sometimes for weeks, then it just sort of fades away and stops.
If it bothers you a great deal, you could see your doctor, who may refer you to a neurologist, which can be very expensive. Or just wait it out, it's annoying, but not serious at all. Most people experience tics at one time or another.

myokymia or benign eyelid twitch:

http://myeyepod.blogspot.com/2011/01/myo…

usually caused by lack of sleep

optometrist
http://myeyepod.blogspot.com/