I'm not quite finished with the program. Currently I'm doing anti-yeast enemas with water, pau d'arco and probiotics. They seem very helpful, but I haven't declared victory yet. Compared to before I started chelating, my symptoms are relatively mild now, but not completely gone yet.
Don't completely trust heavy metal tests. They are known for giving inaccurate results.
The key questions are:
Did you have known exposure to heavy metals? A lack of known exposure is not definitive since there are a lot of unexpected sources. One of the most common sources is mercury from silver fillings if you've ever had those. Your mother could have passed metals to you through the placenta and/or mother's milk if she had a problem with them. Lead in old paint and tainted drinking water are also possibilities among many others.
Do your symptoms match commonly described symptoms of heavy metal toxicity? You can find these online. You do have at least some from what you described ( Yeast Overgrowth and metals seem to occur together a lot, so a lot of the yeast symptoms are metal symptoms too).
The most definitive way to know if this is your trouble is to try chelating for a few days and see if you react to it (you should feel a bit worse if it's working). It's important to follow a systematic method for chelating since doing it unsystematically can be dangerous. If you would like to give it a try, I recommend beginners use the Cutler Protocol. Definitely find out as much as you can about chelating before you try any method.