Copper IUD?

So I've been looking for a non hormonal birth control method besides condoms. I took the pill for years and then all of the sudden it started making me super sick. I tried it again recently and it made me really sick all the time again, so I dont think I can do hormones anymore. Is the copper IUD dangerous? I guess the thought of copper freaks me out a little lol. What are your experiences with the copper IUD? Thanks ladies.