Can you share some specific stories from the Satcharita where Udi helped cure people's illnesses?

Yes, Chapter 33 provides several examples of Udi's healing power, noted by R. Hari Sitaram Dixit. One story involves Khimji Lalji Joshi's daughter, who was gravely ill and so weak she couldn't walk. After her mother first used Udi for some relief, they took her to Shirdi where Baba applied Udi and blessed her, enabling her to walk in a few days. Another account mentions a friend of Dixit who hadn't slept for eight days; after taking Udi for just one night, he slept soundly. Similarly, a child from Bandra who hadn't slept for two months was taken for Baba's Darshan and began sleeping normally that very night.