Lion’s Mane Mushroom (Hericium erinaceus) is a natural supplement that may help regenerate peripheral nerves. For nerve regeneration, a common therapeutic dose is 3000 mg of high-quality extract per day. The total dosage can be split into 2-3 doses a day. You might also want to consider Acetyl-L-carnitine, B-Complex vitamins (especially B1, B6, and B12), highly concentrated omega 3 fatty acids, and Magnesium (glycinate, oxide, citrate). These supplements won't work overnight, but taken consistently over months, some people do see improvements.
Magickal Squares can be used: A Mars square (both Spiritual and Material) is particularly beneficial for matters related to the reproductive organs, sexual health and vitality, while a Mercury square (both Spiritual and Material) is ideal for addressing issues involving the nervous system.
Example of Runes that can be used for healing are a combination of Thurisaz (regeneration), Ansuz (overcoming obstacle), and Wunjo (physical healing).
You may also want to perform Lord Valefor's ritual and ask him for further guidance, since dealings with the nervous system is a delicate and complex matter.