What ailment did Amir Shakkar have, and what kind of 'medicine' did Baba provide for him?

Amir Shakkar was suffering from a physical ailment, specifically rheumatism, which caused his body joints to be seized. The 'medicine' that Sai Baba provided was not a physical remedy but His word alone. Chapter 22 highlights that despite the damp, windy, and cold conditions of the Chavadi which were contrary to his health, Baba's firm words were the treatment. Baba told him not to worry about the conditions of the place, and Amir accepted this command as his medicine. His internal faith in Baba's word was so certain that it helped him endure, and as a result, 'everything went well.'