Mine is similar as well...pounding heart, even through the mattress when you are trying to sleep, that's the worst! I get shaky and nauseous...most of my panic is being afraid I will get sick. I hate to say that in the past I have made myself sick from panic. But I feel now that I have meds to help, and I have more wisdom than I did, and know my body more...
I do find that pressing on your wrist (acupressure point for n*) really does help. It's about 2 finger widths down from your wrist, between the tendons. But all this panic is a horrible feeling...usually happens to me at night. Feel all alone!