I had the same problem with Micronor! I stopped taking it two weeks ago because I felt like I was PMSing all the time. I was on it for a year also but the moodiness got MUCH worse when my cycle came back a few months ago. I felt a lot better after a week of not taking it and I am almost back to normal now after 15 days. I did read somewhere that it can stay in your system for up to three months. My next step is the Paragard too.
Wife to awesome DH, and Mama to DD (6/05), and DS (12/07)