Sick Headache, a Favorite Remedy for

"Aconite liniment or aconite rubbed on the forehead will relieve the pain in the head almost instantly. One drop of the tincture of nux vomica in a teaspoonful of water every five or ten minutes will quickly relieve." Nux vomica is good only when the headache comes from constipation and stomach trouble and too high living.

Source: Mother's Remedies: Over One Thousand Tried and Tested Remidies from Mothers of the United States and Canada, T. J. Ritter