I just came across this-I know how you felt because I feel that way now. I had to euthanize my first chicken last night after 2 weeks of trying to treat probable Mareks. I fought for her because she was fighting. But when I came home yesterday she was suffering and my husband was at work. I read all the techniques. I wasn’t comfortable with cervical manipulation. I decided on decapitation although it seemed very traumatic and out of a horror movie. I didn’t feel comfortable with a knife. I used my husband’s table saw. I started puking and hyperventilating afterwards. Couldn’t sleep last night. I’ve felt sick all day. I know I’m an animal lover and tenderhearted but I’m a nurse so I thought I could handle it. I know I did the right thing but I feel so awful and I’m not sure I’ll ever forget that.