Karen,
I was in a similar situation once, just one other employee and myself working when we were robbed by two men. It did take me a couple of days to be able to sleep well. Actually I resorted to taking a couple of pills the first night or two to knock me out. Your feelings are appropriate and it just takes a bit of time to work it all out. It was a tramatizing event and you really shouldn't try to shortcircuit the recovery process. Just give yourself time to heal. I am sorry this happened to you though and I so glad you are safe.
Keli