Who was Amir Shakkar and what did Sai Baba prescribe as a remedy for his illness?

As detailed in Chapter 22, Amir Shakkar was a devotee who was afflicted by a severe case of rheumatism. After he approached Sai Baba and narrated his illness, Baba did not give him a physical medicine. Instead, Baba's unique remedy was an instruction: he was to stay steadily in the Chavadi. Despite the Chavadi being a dilapidated and uncomfortable place, Amir was told to accept Baba's word as his medicine. He followed this instruction and resided in the Chavadi for nine months, demonstrating his faith.