I've been having panic attacks since 2019. It mostly appears when I can't sleep at night. I get tremendous palpitations. My heart starts beating so fast I can even hear it and my body starts shaking. I can't breathe probably and become really sweaty. Mostly it lasts for 2 hours, somedays it lasts for the whole night. While this happens I get constant dread. I feel like I'm dying and all the other bad things start to come to my mind. I take clonazepam occasionally but continuing this med gives me really bad headaches.