I can so relate to your lost. I lost by Dad 2 years ago to COPD. I do the same thing from time to time, listen to his old voicemail just to hear his voice. I happened to have saved a voicemail he left on my last birthday before he passed, wishing me happy Birthday and telling me how much he loves me. I am grateful to have that. I'm so sorry you are having a difficult time moving forward. Don't rush it, Take your time. I think it just come naturally with time. Your Mom sounds like she was a wonderful caring person. I imagine she would want you to be happy, keep cherishing the family you do have left and enjoy life to the fullest. That's what I tell myself when I find myself stuck in what I call "the moment of the loss of him" I know that's what he would want for me.