Richard, Thanks for all the great info. I guess I must be having panic attacks because I have most of the symptoms you mention. The only thing I don't understand is the fear, anxiety, dread, etc. How can I have them when I wake up from a sound sleep in the midst of an attack? I'm not having nightmares at the time that I can recall. It seems a purely physical reaction over which I seem to have little control. However, after having three rather close together I haven't had any during the past two days and feel much more "normal," whatever that is for PDers. At least the problems I'm experiencing (on/off, etc.) are the ones I'm used to. Better the devil you know than the one you don't. Pat