What you're feeling is perfectly normal. It's unbelievable how attached we get to these sweet birds. I'm so sorry for your loss, and I hope you get those darn raccoons!
One night I remembered at 11pm that I hadn't shut the coop. My chickens free range during the day, and I shut it at dark. Usually. But this one night, I went out at 11 armed with only a flashlight to find my neighbor's dog in my coop having a free-for-all. She saw me before I got there, yelling and screaming all the way, and took off back home. I couldn't sleep for days, I was so sad and angry. The neighbor did chain up his dog, after I found her one more time on my property and he saw me waiting with a .22 to shoot her. I never had a problem after that.
I have lost two to skunks this winter though, once again when I didn't get the coop closed early enough. Losing those birds was my fault. They died because of my carelessness. It hurts like heck!