I had my daughter when i was a few months shy of turning 18, so i decided that i didn't want to take the chance of getting pregnant again so young, so my husband and i did research and found that mirena was the best way for me to go, or so we thought.
I started to have pain during sex, and the string would actually cut my husband, even after the string was trimmed 2x (ouch!><),had no libido, vaginal dryness, weight gain and on top of it all, i also experienced anxiety and depression. i had to quit breastfeeding my daughter,not by choice, just dried up (doctor said it wasn't because of mirena, but i suspect it was)but 3 years later, i still have a little white/grayish leakage from my breasts...
...i had no period while i was on it (which like you, i WISHED i did) which was for almost 3 years, and almost six months post-removal, still no period. the day after the removal i had painful what i'll call 'a-not-a-period' after it was removed for about 3-4 days. (i call it that because i think it was just from the removal...And, besides the no period part, there was a big improvement in most of my symptoms almost instantly! if the pill worked fine for you, i would encourage you to do so again, to try to avoid any more symptoms or worsening of your symptoms...
these are some of the side-effects of mirena:
Lower abdominal pain (cramps)
Acne or other skin problems
!!!THESE ARE THE SOME OF THE SYMPTOMS *NOT* LISTED IN THE MIRENA INFO BOOKLET!!!
CONSTANT bleeding (up to 9 months)
Heavy bleeding and clotting
SEVERE Lower abdominal pain (cramps)
SEVERE joint and pelvic pain
SEVERE Acne or other skin problems
DEBILITATING Back pain
SEVERE weight gain
SEVERE Mood changes and wood swings
Loss of hair
SEVERE depression and feeling of hopelessness
Increased body hair
Incontinence and constipation
Many many more