Hopinso is right. My boyfriend's mother was telling us a story about her friend, who came down with severe dizzy spells. It got so bad that she couldn't even leave the house or drive, because she could not keep her bearings and would fall over and run into objects. She went to her doctor and went through tons of tests, for months on end. The spells just kept coming, and now every time she even moved she was dizzy. They kept thinking something was wrong with her ears. However, she researched on the internet and found some people who had her exact problem-- and they had found out that Aspartame can cause severe dizzy spells and vertigo. She quit Diet coke immediately and her symptoms vanished within days. She asked her doctor who said 'oh yeah, Aspartame will do that. I am surprised you didn't mention you were a diet coke drinker'. Good grief. Her doctor hadn't thought to ask, either. She was drinking 2 to 3 of these drinks per day. If that substance is so strong as to cause this violent of a reaction, it is NOT good for you to be drinking. Please consider this.