Can't Sleep, Heart Racing: Need Advice

That's terrible. I'm so sorry to hear that you're having so much trouble. Have you spoken to a doctor about your sleeping troubles? I know for me, what finally worked was Seroquel/quetapine. Also, have you tried those guided meditation videos that talk you through regulating your breathing and so on? I know that those work for a lot of people, even though I've never had a lot of luck with them. As for the racing heart feeling, it's just your body saying that it's tired, and it's probably some anxiety related to it because you haven't been able to sleep. Just try some slow, deep breaths and try not to focus on your racing heart rate. I know when I used to have days like that, hyper focusing on it would just make it worse. If you're already on a prescription sleep aid, and it doesn't working, you need to either talk to your doctor about changing the dosage or changing medications.