Rae, just something I found about survivor's guilt after a traumatic event that I thought might be helpful to you later, when you're less raw from this experience. Here is the full article, and a section that I thought was especially relevant is below.
"When endangered, the body responds neurochemically to propel us to protective action (counter-aggression, stillness, or flight). Survival becomes a neuro-biological as well as an emotional imperative. During and after traumatic events, individuals often must find immediate ways to survive.... Studies suggest that, after an event, people overestimate their preexisting predictive knowledge of the event (Fischhoff, Crowell & Kipke, 1999). This overestimation can lead to an inaccurate assessment of culpability."
Basically, this is a normal reaction for your body and mind to go through after an incredibly terrifying, violating event. Feeling glad that you are physically unharmed isn't the same thing as being glad that someone else was hurt worse. Be really gentle with yourself as you're recovering from the trauma, okay?
And because I omitted to say so before, and I'm sorry that I didn't, three cheers for your wonderful supportive husband. I'm so glad that he was - is - there for you when you most need him to be.