I found out about this chronic disorder that can be cause mainly in women in our age group. It can be triggered by change in hormones or infection. It totally wacks out your nervous systom. And basically if you have it you have it forever and all you can do it try to cope with the pains that you have. I have so much joint and muscle pain and tiredness and now to find out I could be messed up forever because mirena I do all I can to get through a day to take care of my 4 and 1 year old ;and if anyone knows of a class action suit please contact me. tchaffee15@hotmail.com here is the website that I read up on Fybromyalgia. check it out. http://www.mayoclinic.com/healh/fybromyalia/DS00079/DSECTION =3