Margarita, hugs to you. You have been a rock in this thread, working tirelessly for these girls and all of the others. I don't know if it is any comfort to you, but cops, firefighters, EMS folks, they all have the same feelings you do. Sometimes you are able to compartmentalize them, and sometimes they get the best of you. Talking helps. Especially talking amongst those (like us here) who have just gone through the experience with you. It is why critical incident stress debriefing is such an effective tool. After a particularly bad call, we would all sit in the kitchen of the fire house casually discussing it. It normalizes what just happened and reminds you that you are not alone. Talk to the people who can understand. Get your feelings out amongst those who are having similar feelings. It doesn't make those feelings go away, but it helps to put them in perspective.
This case is an emotional landmine field. It has changed my world too. I get up throughout the night to check that my windows and doors are locked, and to look in on my daughters. I bought a huge German Shepherd and don't let them play outside without out him. But it also meant that a few months ago, when I got a niggling feeling in my stomach from a guy when I was out hiking, I took several pictures of him and his car/license plate, despite how uncomfortable doing so made me. I stared him down with my camera raised. Bless you Libby for teaching me how to be so brave. Side note, later that day, the same man assaulted a woman in a state park one town away.
http://whdh.com/news/woman-assaulted-at-callahan-state-park-in-framingham-police-say/
Take a break if you need to. There is no shame in that. Your health has to come first. But whatever you do, talk talk talk. Don't let these feelings fester. Much love.