What can you infer about Macbeths mental state from his reaction to his wife's death?

"She should have died hereafter. There would have been a time for such a Word." What Macbeth is saying is "I don't want to hear this now. It would have been better if you'd told me later." With an invading English army approaching his castle he cannot lose focus. This is not the time with dealing with his feelings about his wife's death. Nevertheless he feels them, because they send him immediately into that bleakest of soliloquys, "tomorrow and tomorrow and tomorrow creeps in this petty pace from day to day."