Confusion and Anger
Luke's was in pain not just from his recently served hand but also emotionally. "How could Ben lie to me?" he said to himself. He then thought of what Vader said and it filled him with anger. How could that monster be my father and then he realized that Vader wasn't lying. All those years of thinking that his father was a good and honorable Jedi knight was just a lie conjured up to hide him from the truth. His true father was a monster. Luke leaned against the wall of the tunnel until suddenly the floor gave way below him. He was left dangling from a pole and started calling out to Leia telepathically.