It does sound like the Mirena crash. I also have 2 iud's total of six years, and never thought i had any side effects until one day i just passed out and since then nothing has been the same. I also had to go the the ER because of extreme weakness, panic attacks, no appetite, nausea, dizziness, and feeling of fainting; and as well they did not find anything but my potassium being a little low. At that time I still had my iud, so I started searching and found this forum. I'm 4 months post mirena and i can tell you that is hard but it will get better, I'm my self still struggle with many symptoms. Coming here has help me a lot with support and getting a lot of answers. Hope you feel better and be strong.