You have to be like this. You've lost a best friend and a part of yourself. It's okay to be sad and mourn that loss. My heart hurts for you; I still miss my dog and it's been 5+ years since she passed. In a week if it's still keeping you from functioning, put there stuff out of sight for a while and focus on "keeping level." Then deal with it when you can/want to. Some people have to get rid of things immediately because the revisited pain later isn't something they feel they can handle. I'm so sorry for your loss. Everything's going to be ok.