Can you tell me the story of Amir Shakkar and how Sai Baba treated his rheumatism?

Amir Shakkar was suffering from rheumatism and sought a remedy from Sai Baba. As described in Chapter 22, Baba's cure was not a physical medicine but an instruction: he was to stay steadily in the Chavadi. This was a difficult prescription, as the Chavadi was old, dilapidated, damp, and filled with creatures like lizards and scorpions. Despite the miserable conditions, Amir stayed for nine months based on his faith in Baba's word. The text notes that while all external conditions were contrary to healing, his internal faith was certain, and his constant proximity to Baba was the true remedy. Baba's word and the devotee's faith were the core components of the treatment.