I don't know much about the supplement you've been taking, but I wonder if it's effectively removing the mercury. It may be redistributing it and not removing it effectively enough.
As I'm sure you know, chelating can cause yeast symptoms to flare, so that is a possibility.
Chelating may also be causing the depletion of a mineral. I had trouble with Iodine and hypothyroid symptoms. You might try supplementing with Iodine and see if that helps.
That being said, the side effects of chelating are extremely variable. Though I don't usually hear of people whose side effects continue for over a month after they stop a round of chelating. However, I chelated on a regular schedule, so I never waited a month before chelating again, so I can't be sure.
I suggest you try Cutler sooner and see if that affects your symptoms.