How to reverse post heavy metal and vaccine etc.problems?

I am interested in homeopathic remedies [and also other natural (herbs, nutritionals, vitamins etc.) ways] to reverse, chelate, or otherwise clear the system of the effects of past vaccination, both as to the vaccines themselves, and as to the mercury that might be in them, as well as heavy metals that might have been accumulated via other sources, and also such things as fluoride in water.

This question is being asked in regard to both a human adult and a child in my family, and also our dogs.

DOG:
In the case of the dog I have read that strammonium may be especially helpful for post rabies vaccine problems, but am concerned about having an aggravation of symptoms if that is wrong choice.

I am not sure if the problem is the rabies vaccine itself, or the mercury in it, but definitely there was a change in behaviour ("never been well (or the same) since" the vaccine given).

The dogs were 'rescues' and may have had other vaccines before I got them--it is even possible that the dog who had problems had just had a rabies vaccination and then had it repeated due to law requiring it if there is no proof of previous. They have only had the required rabies vaccines since I have had them.

ADULT HUMAN: in the case of one of the adult humans there is some semblance of chronic post polio which could be either any heavy metal, or a chronic situation from a live polio vaccine. And some neurological problems have been experienced. There was a lot of Mercury exposure. There was also some Lead exposure. And Flouride exposure.

HUMAN CHILD: In the case of the child, he was in foster care and received all (many!)required vaccines and other treatments as overseen by state government requirements. (And this still continues, and cannot be opted out of under the rules of his jurisdiction.) He had delayed speech development, and at one point poor physical growth ("failure to thrive"), though both have been improving some now. He is 3 years old. His mother died days after his birth and he was put in care at that time.

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It looks to me like Hahn. might have been using sulphur and sulph containing remedies to help with mercury toxicity from past medical interventions? ???

Perhaps as "intercurrents" with other treatment???

this seems to have to do with psoric miasm which would be "Itch" --skin related. Skin does not seem relevant in any of the above 3 situations. All have more to do with neurological issues one way or another. Although "miasmic" issues may still fit since various exposures would also have been present for the parents of the adult, child and dog.