Terrified to go to sleep

Tonight is the worst of the last 5 days....the reliving, remembering, flashbacks, nightmares.  Feeling like I'm right back there again.  

The tranquilizers my head doc gave me dont really seem to do anything for the nightmares...more so just makes me feel not in control.

I keep think about getting that phone call at 410am....what do I do....I just want my mind to shut off, nothing but a void.