What ailment did Amir Shakkar suffer from, and what was Sai Baba's unconventional remedy for it?

Amir Shakkar was afflicted by severe rheumatism and sought a cure from Sai Baba. As narrated in Chapter 22, Baba did not provide a physical medicine but instead gave him a specific instruction as the remedy. Baba told Amir that he should stay steadily in the Chavadi. Despite the place being old, dilapidated, and uncomfortable, Amir was to accept Baba's word as the true medicine. He followed this instruction and resided in the Chavadi for nine months, placing his faith in Baba's command over the contrary external conditions.