meat27, I know how scary this is believe me! I went through it too, IT IS THE MIRENA, and that is what we forget, how did you feel before the mirens? Great I bet! Have you had a history of chest pain, heart problems? probably not, are you fairly heathy otherwise, probably, I try now to think logically opposed to being negative, although I have had some BAD times, I am 9 weeks post removal and the chest pains I get are from anxiety does it feel like a tightening? and then it feels like your heart feels funny for a bit(maybe a short pain that is not consistant), it is normal when it come to anxiety because your first response to fear is rapid heart rate, and of couse the anxiety makes it 20x worse! I had many discussions with my family dr as well, I switched ob's and she said that as any hormonal bc the mirena can cause all of the same problems, I know you are scared and that makes everything even more difficult, if I am correct you are about 6 weeks post? Please give it a bit more time, obviously if you feel you need help go to the dr or the ER, I went through chest x-rays, 2 EKG's, all blood work possible and all was perfect. Logic over anything else does really help. I hope you begin feeling better soon. We are here for you.