The number of people who experience the miracle you describe are very few. And even those people should chelate to get the mercury out. Most people only feel the miracle after months or years of chelating. I can tell you that the mercury does not leave by itself. You have to remove it.
You are eating sugary food? Couldn't that be the reason you are experiencing reactions?
I still have (mild) reactions, and I've been doing this for a while. You can't expect to be reaction-free so soon.
Remember, it took me 6 months of regular chelation before I felt better. How long have you been doing it? It's taken me a few years to reach the point where I can regularly break my diet without serious side effects.