I had mine inserted 5mo ago. I have all the same symptoms (no sex drive, severe moodiness, possible depression, high irritability making it difficult to deal with my 3you). I was hypo-thyroid before, and unfortunately for me - my new GP lowered my thyroid dose at nearly the exact same time I quit my mini-pill to get the IUD. I do feel better for that day, when I take my higher dose pill, but I don't know if it'd be sustainable over time (as my doc won't prescribe me out of normal lab ranges).
The only thing I haven't gleaned from the posts attached, is were folks on versions of the pill before Mirena? I believe my mood swings/depression/(not sure of low libido) are probably my normal state. I had had pills switched on me, with drastic mood changes. My mother has drastic mood swings/depression. I had been on the piill for the last 17 years, minus my two pregnancies. My OB did tell me that Mirena wouldn't fix my "moodiness" problems, if I had them w/o the pill - but I wanted to try it and see.
Reading these posts makes me realize, this is my real problem - I need a regular dose of BC pills to feel normal, have my whole life - not my thyroid. I guess I'll stop getting so concerned that I cannot get in to see an endocrinologist for another month - hopefully my 5 min appt to get this thing out will happen next week!
Thanks to all and good luck to you!