Lilian Yeomans (1861-1942) was a medical doctor, who became a morphine addict.
Desperately, and diligently, she undertook a quest to discover the biblical principles of spiritual healing. In doing so, she was cured of her addiction. She went on to become an evangelist and healer in her own right.
You may find the PDF copy of her book, Healing from Heaven (c. 1926) here: HEALINGYEOMAN