hi well at least we know that not having had children is not part of the problem, which makes it all the more urgent to get the thing out, i would say. I know mirena is a convenient form of birth control, but no amount of sex is worth the pain and damage to your health that you are going through at the moment!!
many people have gone onto the natural form of birth control after mirena, (because to be honest, when your hormones are messed up, the last thing your body needs is more synthetic hormones!!) - this is where you really get to know your body and work out the most fertile time of the month, then avoid having intercourse at that time. That combined with a condom is pretty effective. If you go to the following website, you can program in all your symptoms, your dates of periods etc (once things settle down a bit) and it will notify you by email when the fertile time is coming up, which is a handy reminder.
i am sorry, i forgot to include this other site for you, which you should print out and take to the doctos with you. it includes side effects and mentions the chills, dizziness and other things, may be useful for you.