Final answer:
Macbeth's mental/emotional state is highly conflicted, with a blend of hesitation, guilt, fear, and a resolve to pursue his ambitions. He is pressured by Lady Macbeth and struggles with his conscience, leading to further dark and manipulative actions.
Step-by-step explanation:
At this point in the play, Macbeth's mental and emotional state is turbulent and conflicted. Initially, he is hesitant and plagued by guilt and fear, but under Lady Macbeth's influence, he resolves to mask his trepidation and commit regicide. Throughout this phase, Macbeth displays a struggle between his ambition and his moral compass, clearly evidenced when Lady Macbeth chastises him for his cowardice, when he hallucinates about the daggers, and his tortured rationalization after murdering King Duncan.
Macbeth's guilt is further shown when he speaks of his dull brain being wrought with forgotten things, and his sense of inevitability in his aside about time and the hour running through the roughest day. He is a character constantly trying to reconcile his actions with his conscience, leading him to a path of further darkness and manipulation.