How would you describe Macbeth's state of mind as he makes his way to Duncan's chambers in Act 2 Scene 1 of Macbeth?

As Macbeth makes his way to Duncan's chamber in Act 2 Scene 1 of
Macbeth, he feels anxious about going through with the murder. He imagines
that he sees a dagger, and he knows that the image is simply a hallucination caused by his own
fear, guilt, desire, and ambition. He says that the dagger is a result of his "heat oppressed
brain," and here the audience understands that Macbeth is experiencing extreme anxiety. He is
still a bit unsure of whether or not he should actually go through with the murder, and he
considers that if he allows Duncan to live, then his dreams of becoming the king will not come
true. When he hears the bell that has been rung by Lady Macbeth, he puts his fears and doubts
aside and goes ahead with the murder.