I got a call back from Dr. Greenfields office. The reviewed my MRI's, operative reports and everything and they don't think that these headaches are being caused by chiari after all. He thinks that I have a herniated disc (or 2) in my neck that is compressing the cord and also blocking the csf flow, kind of like the chiari did, and causing a similar headache. I don't really have any other symptoms of a herniated cervical disc, just the frequent headache. I was so shocked by what they told me, it will be so nice to have something "normal" for a change to be treated! LOL. I had no idea that a herniated disc could block csf, dos anyone here have any experiences with that?