Contraception: Mirena Coil - the good and the bad

I have just finished work and was looking forward to chilling with some chocolate while I caught up on my homework. Instead I'm on the verge of tears, pressing my hot water bottle to my stomach as hard as I can to stop the pain :( You see 3 weeks ago I had the Mirena fitted by my doctor. I had tried everything else and this was my last option. I suffer from terrible cramps and the doctor thought I could have endometriosis for awhile but said if I did it was only mild. She said women who suffer from the pain of endometriosis use the Mirena to control the pain, so I was encouraged to do the same.