There is a guy from the blog How I Recovered who is also a member on here. He had to stop after a year due to something he called liver congestion. It sounded like he had been increasing his doses too fast.
I had to make several adjustments after my first round, but am doing ok now. I'm on round #12.
I've tried some other types of chelation and had much worse problems, now I know why.
There are several support groups if you're having issues. I think the Frequent Dose Chelation Yahoo group is the best.