You need to see an opthalmologist to look into the droopy eyelid. It could be due to some inflammation in the eye or simply a stretching of the eyelid tendon called involutional ptosis. Finally there are some neurologic disorders (horners syndrome and third nerve palsy) that can cause a drooping eyelid. So as you see, it's not quite as simple as you think at first. Good Luck.
Michael Kutryb, MD