I would encourage you to get the heavy metal testing done, as that can really play a part with issues in trying to heal from these infections,
I prefer activated charcoal, but that's because the Diatomaceous Earth causes massive constipation for me.
I can keep up with the extra water needs with the activated charcoal, but not D.E.
I would definitely encourage you to try the Cat's Claw again - only this time start off with a much smaller dose - like maybe only the 1 drop and raise your dose slowly until you start having symptoms increase - then hold there and do all you can to reduce your symptoms by detoxing, but you can always lower your dose back down by a couple of drops until you get the increased symptoms (herxing) back under control and then carry on again.
But, you will need more than just cat's claw to take care of the infection. Do you have a protocol chosen that you wish to follow?