I heard Amir Shakkar was sick. What was his illness and what was Baba's prescribed treatment?

Amir Shakkar was suffering from rheumatism, which caused the joints of his body to seize up. As detailed in Chapter 22, Baba's treatment was highly unconventional. Instead of a physical remedy, He instructed Amir to stay in the damp, windy, and cold Chavadi for nine months. Baba's firm words were his only medicine; He told Amir not to weigh the difficult conditions of the place. Amir accepted Baba's word as the 'Great Prasad' and, through his certain internal faith, stayed there happily, finding that everything went well despite the externally contrary conditions.