I don't know much about removing copper since I mainly chelate mercury, but I suspect there are similarities between the different kinds of chelating.
With mercury, you can tell it's working if your symptoms become temporarily worse. I believe it's a body's reaction to the sudden reappearance of toxin in the bloodstream. It can take months of chelating heavy metals before you see an obvious improvement. Perhaps copper is similar.
@SB1108 I suggest you try a lower dose when you begin chelating again. A trip to a sauna and drinking lots of water may help too if you haven't already done so (or at least it helps with mercury).