Maybe it is from something other than aspartame. Though it could be you are exposed to some form of hidden aspartame, or are overlooking a product you don't think of as being sugarless (like most Sugar gums now contain Aspartame as well as sugar). Some health products like drink and protein powders, or vitamins contain hidden Aspartame which they do not list on the label. Look for this warning "attention Phenylketonurics: contains Phenylalanine." If you find that on a label, it's got unlisted aspartame.