I understand Malati is having some rheumatic condition, and it is causing pain and numbness. The best thing is to take hot baths, and massage with camphor oil, and if it is too much painful, use Sloan's liniment. Best thing is to consult with some expert physician. The Ayurvedic medicine which I could recommend is probably not available in London, but if there is any Ayurvedic shop let me know and I shall recommend some medicine. The best thing is to chant Hare Krishna loudly.
Letter to Syamasundara, 10 October, 1968