You mean DMSA or DMPS (not DPSA). Obviously I don't know anything about your doctor but there are lots of people who have gone to doctors and the doc has persuded them they'll be safe in their hands and got worse. Then they've gone to Andy afterwares to help pick up the pieces. Do some more reading first or join the groups I mentioned. Do not go for once a month injections!!
Andy doesn't mention any of those things as he thinks they are either dangerous or don't work (apart from pectin which is a good thing to use).