Thanks for your comments Lisa. My neurologist is suggesting a round of Prednisone next. She would try the Occipital Nerve Block but my insurance won't cover that...although I'll be asking what it will cost if the Prednisone doesn't help. I was intrigued by leamm @leamm comments on Adenosine. I normally have no difficulty falling asleep and have never been a "morning person", finding it difficult to jump up and get going...so maybe I do have an abundancy of this sleep hormone. I wonder if others with these headaches might, as well.