Through exercise, for instance by walking for twenty or thirty minutes every day, you build your physical strength, release tension, and keep yourself well. Be willing to change things around. It is natural to wish to keep things the way that they were when our loved one was still with us. Still, that doesn't keep them alive. Know that healing isn't necessarily quick and easy.
Grief takes as long as it takes.
Take care of yourself and you will begin to heal. Recovering from grief means a lessening of the pain of your loss, so that in time it becomes tolerable. But of course your love will last forever. All through your loved one's illness, you struggled with hope. And now that you are grieving your loss, the same question is still there.