What was wrong with Amir Shakkar, and what unconventional remedy did Sai Baba prescribe for him?

According to Chapter 22, Amir Shakkar was afflicted by severe rheumatism. When he narrated his illness to Sai Baba and prayed for deliverance, Baba's prescribed remedy was not a physical medicine but a specific instruction. He told Amir that he should stay steadily in the Chavadi. This was a surprising and difficult instruction, as the Chavadi was a dilapidated and uncomfortable place, but it was the cure Baba offered for his ailment.