For over a week, my right eye is twitching/pulsing/throbbing..not sure what the correct term is. It is not my eyelid, it is the puffy region under my eye and this pulsing is visible in the mirror. I just had my eyes examined, but everything there is healthy and the optometrist said the twitch should go away, but this has been going on for about 8 days now, any idea what is going on?