Hi and welcome to the Chiari forum.
Well from what I can read, as Pam noted u have chiari malformation...this is the malformation of the skull which forces the cerebral tonsils down onto the brain stem and since the area which should hold the cerebral tonsils is malformed and too small u can have overcrowding as well....the overcrowding can cause and obstruction to the flow of CSF...this is vital for it to flow, when it stops, so do the signals from the brain to all extremities, organs...etc....when this happens, u can suffer a drop attack....but balance issues, blurred vision, HA's, r the main issues one with chiari deals with.
We do have a list of Chiari drs for u to use to aid ur research into chiari drs, it is not meant as a referral-not knowing where u r from, this list may not be of help as it is for the US...we do have a few other small lists started for Canada, Australia.....let us know if we can be of help-
http://www.medhelp.org/posts/Chiari-Malformation/LIST-OF-CHIARI-SPECIALISTS/show/1293483
"selma"