I didn't read Mrs. D's links yet...but do plan on doing so. I do know that for myself and many others that rebound headaches can be a factor AND IMHO, folks who are prone to headaches seem to be prone to rebound ones! It's all kinda crazy in a way. I have found that getting on the preventative Topamax (FDA approved for migraine prevention) helpful in preventing migraine and other types of headaches. However, this medication is frustrating and I only think it is a good idea to take when the problem is severe interferring with daily living. Other things that I have found to help would include careful attention to all the potential headache triggers out there...and food might be the number one culprit. There are some foods that might surprise you that trigger headaches. For example, bananas are a big problem for me...but do not bother other people. If you are exposing yourself to one or two triggers, it could be causing this problem. There are other possibilities...less likely...like a heart condition called a PFO that only a doctor can determine might be a possibility. It often takes a multi-discpline approach to put a dent in the frustrating problem of headaches. If you are not seeing a specialist (probably a neurologist) who has an interest in headache/migraine treatment, I would consider making an appointment.