yes. i had side effects too, and they seemed to last forever.
have patience. its expensive. it does pay for itself after a year, but i wouldnt recommend wasting your (or the insurance company's) money when it works so well after a few months.
the biggest complaint i had was that it seemed like i was spotting for weeks and then i would have a few days off and spot some more.
but that stopped completely around 2 months after placement, and i have had maybe 5 spotty periods in over a year - its comfortable, and i dont have to think about it. my husband loves it, though he at first had complaints about getting poked by the string, after about 3 months the string finally softened, and its fine now.
also, if you are doing a check for the string periodically, dont panic if it disappears, mine has disapeared, the doc did an ultrasound to find it, and it was still there, just the string is up in there too.. which is fine, it can sometimes disappear, then come back out... but for sure have your doctor check it out.
patience. it will calm down soon, and you wont regret it. :D
one important thing to remember is that the pill goes through your whole body. if you are the slightest bit overweight, it doesnt work as well as it says it should. and the guilt you will have if you get pregnant while on the pill, you always worry if you somehow hurt your baby. my brother is the result of the pill just not working. also, the blood clot risk ... and the fact that you HAVE to take it the same time every single day or it wont work... and the breast cancer risk... all these things are almost nonexistent with the mirena. it works in the uterus, not your whole body, so its pretty reliable, and there is no such thing as perfect/imperfect use. you dont have to remember to do anything, and it shouldnt at all affect breastfeeding. i breastfed my son until he self weaned at 19 months with the mirena, and everything was fine because its localized in the uterus
anyway good luck