From reading your post, I personally think it definitely would be a good idea to consult with your doctor, and possibly get checked out to see what could be causing your lack of interest in sex, mood swings, weight gain, and breast tenderness. Your doctor may want to rule some things out in addition to determining if mirena is the correct choice for you. It's always a good idea to advocate for your health with your doctor. Ask the questions, and don't settle if you are unsatisfied. Let us know what you find out and how you are doing.
Thanks for your comment.