Oh my gosh, I think you might be on to something. I Googled on Copper toxicity, and the symptoms describe my experience to a T. I just ran across a website similar to this one for Paraguard users (the Copper T IUD), who are having identical issues. One posting even said they wished they'd have gone with the Mirena! Here's that link: http://www.mothering.com/community/forum/thread/916122/copper-iud-and-side-ef...
This site talks about it, and how it can affect the fight or flight response, and mess with norepinephrine - the only lab test I had which was abnormally high.
Verrrrry interesting. PM Laredo7, thank you for the post, and if you have time, can you post more details about what your post-mirena journey was like? I've been on this road for well over 3 years now, and am still not 100%. Would LOVE to be over this!