I believe I read this story in the Jewish Observer quite a few years back. The story also goes that the doctor always consulted with the Chazon Ish afterwards, and when the Chazon Ish passed away, the doctor gave up medicine. Either that story or the fact that the Chazon Ish said he could cure cancer, but there is always a worse machala that would take it’s place.
At any rate, regarding this story and the other thread about the person who was never jealous, the Torah says that all the nissim that Moshe did were L’einei Kol Yisroel. We all saw first-hand. I am not sure we are mechuyav to believe any mofes that we do not see with our own eyes. Any mofes which is told over does not carry the same weight. Eino domeh shmiyah lr’iyah. If you get chizuk, then fine. If you think it is a bubba mayseh, that is also fine.