What was the 'medicine' Sai Baba prescribed for Amir Shakkar's rheumatism, and what was Amir's ultimate response to it?

For Amir Shakkar's rheumatism, Sai Baba's remedy was not a physical substance but a profound test of faith. Chapter 22 states that Baba's firm words were the medicine. He instructed Amir to stay in the extremely uncomfortable and damp Chavadi for nine months and not to question the conditions. While Amir was initially miserable in the chaotic environment, he ultimately chose to trust Baba completely. The text notes, 'Accepting His word as medicine, he stayed there happily.' His internal faith was certain, and because of that, he could endure the externally contrary conditions, showing complete surrender to Baba's will.