DMPS tends to be okay when a person has a candida problem.
Make sure it really is candida and not some other gut imbalance. A few people got a stool test and were surprised that it was not a candida problem. I was one.
People in the Cutler support groups typically treat candida at the same time they are chelating--zinc comes to mind but there is a list of things that can be tried. I also used the supplement Candida Helper. A friend did as well when DMSA exacerbated a candida problem. She also uses high dose probiotics designed for the problem. I don't know the name of it.