I read some post on medication.com... there were a few more of us, experiencing the crash around 4/5 period... I hope I can take this as a sign that the hormones are rebalancing. Hopefully is the last crash:)
I went to my cardiologist for the check-up (he wants to see me every 4 months for my palpitations), the nurse told me that they had lately at least four patients with exactly the same problems, all with mirena "inside". Two was trying figuring if it is Mirena, one had an OB that figured it himself, the 4th one was cluless and cardio asked her if she had by any chance the coil fitted.
All of them around 30 to 35.
I hope that cardio will ask this question routinely...