This video runs for about 90 minutes, but it is well worth watching for that time. If you use artificial sweeteners, or diet anything, you need to be aware that the FDA was sideswiped into approving a food additive that is known to cause cancer, and a wide range of other very unpleasant conditions. The man who engineered this process of acceptance despite the evidence was none other than Donald Rumsfeld.
Briefly, the science is unequivocal. Aspartame releases methanol into your system. This is a poison that your body cannot deal with or eliminate: it therefore builds up and inevitably causes health problems. Some people have a higher sensitivity to methanol than others but the more you consume the more damage it does.
Aspartame should never have been released onto the market. The process was distorted deliberately in the interest of making lots and lots of money. Corporate well being is more important than personal well being.