It likely depends on the person. I've read about people who have chelated and had their yeast symptoms disappear completely without any kind of anti-yeast program. I suppose other people may need to do more with their yeast issue after chelating.
It's important to be patient with all of this. Chelating can take a long time to accomplish, but you should feel gradually better as you continue. The metals likely built up over years and may take as long to remove.