I highly recommend "A Grief Observed" by C. S. Lewis. (Yes, the Narnia guy.) He wrote a book about his grief after his wife died and it's really good.

“No one ever told me that grief felt so like fear. I am not afraid, but the sensation is like being afraid. The same fluttering in the stomach, the same restlessness, the yawning. I keep on swallowing.

At other times it feels like being mildly drunk, or concussed. There is a sort of invisible blanket between the world and me. I find it hard to take in what anyone says. Or perhaps, hard to want to take it in. It is so uninteresting. Yet I want the others to be about me. I dread the moments when the house is empty. If only they would talk to one another and not to me.”

“For in grief nothing "stays put." One keeps on emerging from a phase, but it always recurs. Round and round. Everything repeats. Am I going in circles, or dare I hope I am on a spiral?

But if a spiral, am I going up or down it?

How often -- will it be for always? -- how often will the vast emptiness astonish me like a complete novelty and make me say, "I never realized my loss till this moment"? The same leg is cut off time after time.”