I'm so sorry for your loss. I know how we come to depend on our special therapy dogs to help us heal and when they are gone, it feels like there is a huge void where they were. I would just try and tell myself that it is normal to grieve when you have suffered such a tremendous loss and then try and think of ways that you can not 'replace' her when you get stressed but ways that you can cope better with anxiety. That may or may not involve getting another dog. Sometimes, people are so lonesome for who they lost that they cannot fathom getting another dog and others seem to be able to transfer that grief into starting over with a new pet. It is never the same when you have lost your favorite but it can bring peace and ease your suffering. There are also support groups for grieving pet owners, and that might be a good alternative as well. Wishing you peace in your struggles. I totally understand and am so sorry for your loss.