What ailment was Amir Shakkar suffering from, and how did his faith help him endure the nine-month stay in such a difficult place?

Amir Shakkar was suffering from rheumatism, a condition where his joints were seized up. The difficult conditions of the Chavadi, with its dampness, wind, and cold, were externally all contrary to what would be considered helpful for his ailment. However, as Chapter 22 highlights, his internal faith was certain and unwavering. He accepted Baba's word as the only true medicine, choosing to believe in Sai's command over his physical discomfort. It was because of this profound faith that everything went well, and he was able to complete the ordained nine-month stay in that place.