I am so thankful that I googled mirena side effects! I feel like a huge light bulb has gone on!! I had mine inserted in October of 2008 when my son was 6 weeks old and at first everything was great - with the exception of the spotting which seemed like it would NEVER stop. But no other effects until a couple of months in. Since then, I have been so irritable - bordering on homicidal - and every little thing sets off my temper. When I am not homicidal, I am depressed. Add to that extreme fatigue and absolutely no energy. Then, on top of it all (as if the other symptoms weren't bad enough) I have tried everything to lose my pregnancy belly (mainly dieting because I haven't had the energy to exercise) with no luck. I am still wearing maternity clothes 9 months after my son was born. I still look and feel 6 months pregnant. Imagine feeling and experiencing all of this with no clue as to WHY! After reading this thread and others, I know I am not alone and for that I thank everyone who took the time to write about their experiences. I hope mine will help someone as well.