I agree w/ everyone here that too much of anything is bad. And if you have concerns see your doctor.
On another front, you should check out Urban Legends Reference Pages
to check out all the info on Aspartame or other artificial sweeteners. This is the urban legend website who's function is to check out and validate/refute the manias sent out on email and other communication with the intent to scare us to death.
I would guess that to those who invent these hoaxes/stories the furor created gives them endless pleasure & satisfaction. Still, many others propagate the legends by buying in to them and passing them on.