Thanks for all that info. I tried finding info on google but I mainly found ads. I think I may try it but I will only use it if other things don't work. My headaches are from cervical damage and I also have syringomyelia. I pretty much have a headache everyday but it sometimes gets out of hand. If I can stop what I am doing and ice down the base of my skull and neck I can get it under control but, I also want to try to go back to work so i won't be able to just stop like that. I was a sub teacher and working with kids is hard enough then add a headache to the mix and I am worthless. Thanks again Ellie and MrsD, I appreciate your help...Sue