Overwhelmed With Guilt

Last night my cat Ralphie crawled into the dryer. He has never done this before. I started the dryer and did not realize he was in it. I heard a noise like tennis shoes but I didn't realize for twenty minutes that it was my baby in there. When I did realize that I hadn't seen Ralphie in a while I got such a sick feeling in my stomach. I pulled him out and I thought I heard him make a sound. He was hot and limp. I tried to listen for a heartbeat and I thought I heard one but I think it was my own. I tried to give him CPR all the way to the emergency hospital but he never woke up. His skin was bright red. The vet said his neck had been broken and I hope that means he didn't suffer but I cannot deal with the fact that I killed Ralphie. He was a sweet and loyal boy for ten years. I don't know how to get through this.