There is the following statement in the Haṁsadūta: "One day when Śrīmatī Rādhārāṇī was feeling much affliction because of Her separation from Kṛṣṇa, She went to the bank of the Yamunā with some of Her friends. There Rādhārāṇī saw a cottage wherein She and Kṛṣṇa had experienced many loving pleasures, and by remembering those incidents She immediately became overcome with dizziness. This dizziness was very prominently visible." This is an instance of confusion caused by separation.
Similarly, there is a statement describing confusion caused by fearfulness. These symptoms were exhibited by Arjuna when he saw Kṛṣṇa's universal form on the battlefield of Kurukṣetra. His confusion was so strong that his bow and arrows fell from his hand, and he could not perceive anything clearly.
Once the Bakāsura demon assumed the shape of a very big duck and opened his mouth in order to swallow Kṛṣṇa and all the cowherd boys. When Kṛṣṇa was entering into the demon's mouth, Balarāma and the other cowherd boys almost fainted and appeared as though they had no life. Even if they are illusioned by some ghastly scene or by any accidental occurrence, devotees never forget Kṛṣṇa. Even in the greatest danger they can remember Kṛṣṇa. This is the benefit of Kṛṣṇa consciousness: even at the time of death, when all the functions of the body become dislocated, the devotee can remember Kṛṣṇa in his innermost consciousness, and this saves him from falling down into material existence. In this way Kṛṣṇa consciousness immediately takes one from the material platform to the spiritual world.