United Kingdom
I used Aspartame in large quantities for 6 years mainly in the form of diet soft drinks, usually at least a 2 litre bottle a day of Diet Coke.
I recently had to stop because of dizziness and balance loss which lasted for two weeks, when I stopped drinking diet drinks and switched to drinking water on the suggestion of someone I met in a chat room my balance loss and dizziness cleared up within three days. I thought this was probably a coincidence so about two weeks later I started drinking diet drinks again, the next day all my previous symptoms returned. I have never touched Aspartame since.