I am so sorry for your loss. I cannot even begin to imagine what you are going through, that is an experience no one deserves. Is there anyone you could talk to? A family member you trust? A teacher or a work colleague? If you have the money, maybe try and find a therapist if you are ready to talk about it. Rather than writing messages that will stay unread, try and write them down in a book. That way the unread sign won’t be there and it won’t hurt quite as much. I don’t know if you are religious, but maybe try praying. I hope you can get through this.