Hi @catharbert I am using the Shifa tea as recommended by Hank @jesfactsmon. At the time, I got mine rather quickly through Amazon. I use 1/2 the bag to steep with 4 cups of water for 1 1/2 hours. The only difference I do is to freeze the tea in ice cube trays instead because I like it cold. I take 2 cubes at a time added to about 1/2 cup of cold water and drink that slowly when the headache starts. I first drank the tea when the headache was full blown. The headache remained but decreased in intensity. I found the tea totally eliminates my headache at the start. Hope this helps. Toni