I went to dinner with a friend tonight and I was telling her how I gave up the diet coke and she began telling me the story about all the odd things she had began happening to her a number of yrs ago after she was drinking a lot of diet pop & tea with artificial sweeteners - bad headaches, numbness, a rash - she gave up the artificial sweetners & things turned around quickly.
I just found this site packed with information.
Aspartame & Aspartame Poisoning Information Site