Copper
"I had the paragard for about four months. The implantation procedure went well and painless (I have four kids) and the first month went by without incident. By the second month I started having unexplained nausea and dizziness, but thought nothing of it. Figured it was dehydration or poor eating habits. By the end of the second month I started getting heavy periods every two weeks and the nausea/dizziness became more frequent. I could barely get out of bed in the morning no matter how many hours of sleep I got. By the time I got it removed last week, I couldn't function. Nausea, dizziness, fatigue, horrible labor-like cramps in my uterus and back. I was miserable. Feeling 100% better since removal."