AMR1879--As someone with a diagnosed nickel allergy I have been surprised at times by how many things contain nickel. Years ago I cut my leg shaving and ended up with a severe reaction. Another time I got a small scratch on my back from a little piece of metal when I got something out of the back of a pick up, and the same thing happened. If there is a tiny bit of nickel in jewelry, I instantly react.
It is really challenging, but as you said, a far better diagnosis than RA or Lupus, as it can typically be managed. So do you know for certain your implant contains metal? I'm glad you feel relief at having more information. I know I would.