Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

Does that help at all, or do you already know it and it doesn't stop things.
My gut response is to say that you will have this terror and it will last for a while. And then it will end. So you just hang on in there, and count the seconds. And they go and you don't die... and your liver or whatever metabolises the adrenaline, and you come back.
You just have to outlast the monster, and do what you can to rest, and be peaceful and laid back whenever you can. :)
miserable. Depressing, and tiring.