Hi and welcome to the Chiari forum.
I am so sorry u r not getting the help u need, but there are more Drs that do not understand Chiari then there are those that do.
We do have a list of Drs for u to use to research them....the list is NOT a referral nor an endorsement....
http://www.medhelp.org/health_pages/list?cid=186
I know there is a Dr Frimm out there, not sure if he treats adults....
He would be the person to ask if there is another NS in ur area......outside of asking him u may need to travel....many of us have and it is well worth it to go to a Dr then settle with a Dr close to home as it can lead to more issues and problems...so do research them and take ur time. Get ALL testing to rule out related conditions.
Know u r not alone : )