birth control
"I didn't get pregnant and insertion wasn't all that bad. There was spotting the entire 6 months I had it in, but it was tapering off quite a bit toward the end. 

The reason I had to have it removed is because I went almost completly insane. I was depressed, would cry at the drop of a hat, became paranoid of my boyfriend and just very sad/angry in general. I had my GP remove it and now (4 months later) life is back to normal. 

I know some people don't experience any mood side-effects, but I was one of the few."