Śrīla Bilvamaṅgala Thākur prays in his book as follows: "Let Śrīmatī Rādhārāṇī purify the whole world, because She has surrendered Herself completely unto Kṛṣṇa. Out of Her ecstatic love for Him, She sometimes acted just like an addled person and attempted to churn curd, although there was no curd in the pot. And seeing this, Kṛṣṇa became so enchanted by Rādhārāṇī that He began to milk a bull instead of a cow." These are some of the instances of insanity or madness in connection with the love affairs of Rādhā and Kṛṣṇa. In the Śrīmad-Bhāgavatam it is said that when Kṛṣṇa entered the poisonous waters of the Yamunā, Śrīmatī Yaśodā Devī went insane. Instead of searching for curative herbs, she began to speak to the trees as if they were snake chanters. With folded hands she began to bow down to the trees, asking them, "What is the medicinal herb which can check Kṛṣṇa's dying from this poisonous water?" This is an instance of insanity caused by some great danger.
How a devotee can be in a state of insanity because of ecstatic love is described in the Tenth Canto, 30th Chapter, 4th verse of Śrīmad-Bhāgavatam, where the gopīs were searching for Kṛṣṇa in the forests of Vṛndāvana. The gopīs were loudly singing the glories of Kṛṣṇa and wandering from one forest to another in search of Him. They knew that Kṛṣṇa is not localized, but all-pervading. He is in the sky, He is in the water, He is in the air, He is the supersoul in everyone's heart. Thus the gopīs began to inquire from all kinds of trees and plants about the Supreme Personality of Godhead. This is an instance of ecstatic madness on the part of devotees.
Similarly, there are symptoms of diseases caused by ecstatic love. This condition is credited by learned scholars as mahābhāva. This highly elevated condition is also called divyonmāda, or transcendental madness.
Forgetfulness
When Kṛṣṇa was absent from Vṛndāvana and was staying in Mathurā, Śrīmatī Rādhārāṇī sent news to Him that His mother, the Queen of Braja, was feeling such separation from Him that there was foam coming from her mouth, like the foam on the shore of the ocean. And sometimes she was raising her arms like the waves of the ocean, and because of her intense feelings of separation, she was rolling on the ground and creating a tumultuous roaring sound. And sometimes she was remaining completely silent, like a calm sea. These symptoms of separation from Kṛṣṇa are called apasmāra, or forgetfulness. One completely forgets his position when he manifests these symptoms in ecstatic love.