what happens when chelating is that the dmsa and ala brings the mercury that is deep in the tissue and organs to the surface and that next chelation round will remove the surface mercury and remove more deep mercury from the organs and tissue to the surface agian and creates its own detox cycle ,what may have happened is that when you took a break ,your body just kept releasing more and more mercury and when you started chelating again you probably got a double or triple dose of mercury released into your system all at once causing a major detox episode