Now, you are a female and are suffering from a physical illness, which matches the prediction of the Buddha made in the Lotus Sūtra. Why not reaffirm your faith in the Lotus Sūtra and practice it? I am sure this will be effective, but I also would like you to consult Lord Nakatsukasa Saburōzaemon (Shijō Kingo), a skillful physician, who is a practicer of the Lotus Sūtra.

Kaen Jōgō Gosho, Writing About Lengthening the Life Span, Writings of Nichiren Shōnin, Volume 7, Followers II, Pages 114