Hi langfoec!
Your post is exactly how I felt a few months ago. I didn't sleep for about 2 weeks. I was exhausted, but terrified to fall asleep for fear that something terrible would happen to me. It's a vicious cycle which really stinks... the more you don't sleep, the worse anxiety can become. Sleep deprivation is a B***H!
I did a combination of things. First was going back on Effexor which had helped me tremendously in the past. It has been VERY helpful again. Second, I started counseling which included alternative forms of therapy like tapping and imagery. I also read a great book called The Panic Attack Workbook which was quite helpful.
During the night when I would dose off for a few minutes and wake up in a terrible panic, I would go online to an anxiety chat room. I cannot tell you how helpful that was!!! I would do the tapping (tons of info online if you google it). I also pulled out some relaxation tapes and often was able to get a little bit of sleep with my headphones on.
Best of luck to you! I hope you get some well-deserved sleep very soon!