I'm so sorry you're feeling this way. I left my dog when I moved over two months ago and I still miss him and when I think about him I wanna cry. He is still alive though. I understand. Depression is not something you're going to just snap out of. Even though that's what people may tell you. You do not fall apart overnight and you do not heal overnight. It takes time. Take time off if you have to. Seek help. Good luck and take care.