Maybe do some research on Heavy metal toxicity because from what I've read it can cause a lot of other problems and make you susceptible to parasites.
I don't know if parasites are the cause of your fecal odour problems but did you see any evidence of parasites during the cleanse, i.e. did you experience twitching muscles or feel them wriggling? And did you see any in your stools? If you did then you should continue cleansing with humaworm every three months until its gone. If you don't take those three month breaks the parasites can get resistent to the herbs. I've also noticed that the odour is worse during the cleanse because of die off and I have read that when they die they release a lot of toxins, fungus's and bacteria as well, so you have to think of all those things and do your research if you decide to do parasite cleansing.
I think you should maybe try goldenseal for 20 days like Mr hanky did or look up LPN12345's posts and see what she says about the Goldenseal combo she used. It may not get rid of it but it will strengthen your immune system at least.
The other option is to see a Kinesiologist as they are supposedly quite good at getting to the root of an illness.
The only other clue is the heavy metal test coming back positive. It is a place to start so try and do as much research about it as you can. There is also a product called Miracle-Mineral-Supplement (Miracle Mineral Supplement) which supposedly gets rid of everything including Heavy metals.
It is relatively cheap and some people on this forum have had success with it but it isn't an easy supplement to take as if you move up too fast on it it can cause diarrhea and vomiting.
It is really frustrating dealing with this fecal odour problem but I'm really grateful for the internet and this website as it feels as if I am finally making headway with this thing even if its only in finding out what is actually causing the problem.
But I wish you all the best. Keep praying for an answer and don't give up.