I have my mirena for almost 2 years know. I stopped getting my period a month after it was placed & I took a pregnancy test & it was normal. I was happy with not having a period but then I realized I was feeling the consequences. First I noticed nausea, then I started having vision trouble especially when I was driving, then anxiety/nervousness started, then a feeling of post-partum depression which just didn't go away & now I have insomnia constantly waking up in the middle of the night. I recently started getting headaches & fatigue. I am making an appointment to have it removed & to have a physical. I think the side effects start off slowly & gradually get worst. Anything that changes or alters your hormone balance will wreek havoc on your body & mind.