Sorry to hear that you are going through this. I know exactly how it feels. I suffered from it for a long time. My mind wouldn't stop racing, my heart would start racing. It felt awful, as if, I would never be able to fall asleep. You need to talk to a doctor about this. I now take medication to help allieviate the anxiety at bedtime. It helps me fall asleep without any of the anxiety. Occasionally, I do wake up with the panic of it happening again, but it doesn't last. I hope you can get some help so that you can get a good night sleep.