I had a copper IUD for five years, and it completely ruined my health. My hair was falling out, I had depression and anxiety problems, I was gaining weight despite not eating much and working out 5 times a week (and once gained couldn't lose it), my glands were constantly swollen, my face is puffy seemingly permanently and I generally felt awful. I didn't make the connection until I started looking into whether other women were having problems with it, and that's when I learned about copper toxicity.
Basically the copper that is released into your body of course does not just stay in the uterus. This is bio-unavailable copper so your body can't use it, and it's stored in organs, in my case my liver. The medical community doesn't acknowledge that copper toxicity is possible, nor do they tell you the synergistic relationship between copper and estrogen. So the excess copper led to estrogen dominance, I started having skin problems when I've never been one to break out, and my periods were very painful when I'd never get cramps before. I had it removed 3 or 4 years ago, and I'm STILL having problems, because again the doctors say it's not a thing, which is insanity. My liver still isn't functioning properly, and that's had a domino effect on my adrenals and thyroid, my endocrine system in general.
I wish I'd never gotten it.