Can you tell me the story of Amir Shakkar and why Sai Baba made him stay in the dilapidated Chavadi to cure his rheumatism?

Amir Shakkar came to Sai Baba suffering from a severe case of rheumatism and prayed for deliverance from his sorrow. As a remedy, Baba instructed him to stay in the Chavadi. According to Chapter 22, this place was incredibly old and dilapidated, filled with pests, dampness, and garbage. Despite the miserable conditions, Amir was told not to question the location. He accepted Baba's word as his medicine, demonstrating his internal faith. This treatment, a nine-month stay in the Chavadi, was prescribed by Baba, and Amir's acceptance was key to his experience, as the true benefit was the constant company of Sai, which was considered the 'Great Prasad'.