Looly

It used to be that I'd have what I think are panic attacks or anxiety attacks maybe once a month. Now it seems they are coming more regularly like every other night. I awake to feeling cold and shaky and my b/p and heart rate is high. I take 5 mg of valium before I go to sleep and thought this could help me not get this awful middle of the nite feeling. Am I doing something wrong? It's really making me very agitated during the day worrying that I will wake up from sleep feeling like this. Actually I'm afraid to go to sleep. Is there something I could do different? Why do attacks come on when you're not really stressed that day? Is this something that will never leave. I'm scared.