You may want to try a heavy metal binder agent (not a mobilizer) to grab those metals that are being moved around by the chelator.
Chlorella, or better yet Algin, are good ones.
I did a Cilantro chelation 2 months ago and wow I couldn't take it at first, but by using chlorella 30 min before the cilantro I was finally able to tolerate it.
However, my die-off lasted for a full week, so I adjust the dosage to stay in the "comfort-zone" while my body adjusted. I did the cilantro chelation for 3 full weeks and it helped me a lot.