Oats are one of the best.
I prefer to use oatstraw myself. It is a good B vitamin source and silica source both beneficial for nerves. Juniper berries, and rosemary are excellent for strengthening the nervous system. Though juniper berries should not be taken fo rmore than 4 days without a break, and should not be used by those with kidney problems. They also drop blood sugar very well, so should be used carefully by those prone to hypoglycemia.