Hi and welcome to the Chiari forum.
As Lisa mentioned , many Drs dismiss Chiari as a reason for the many symptoms and issues we deal with....so it may have been noticeable on ur CT, but was not reported as the radiologist and Drs felt it insignificant.
And this stage one description is one I have heard b4, but do not understand....there are types, not stages of Chiari.....
I also had the jaw clenching and it can be the Chiari....I had my Dentist rule out TMJD and he suggested I use a mouth guard while sleeping to help with the pain I woe with in my jaw....the ones u can get at a sporting good store that u mold to fit ur mouth is best....and less expensive then one the Dentist will offer....
Getting copies of ALL testing like Lisa mentioned is very important, make copies and then u can just about go where ur INS allows to get opinions.
U deff want a true Chiari specialist to review all of this for u....see the list of Drs we have and use it to research them...as the list is not a referral nor an endorsement.
http://www.medhelp.org/health_pages/list?cid=186
Getting all the right testing done like the CINE Lisa mentioned along with MRI's of ur complete spine to rule out ALL related conditions is also very important.
U have others here that can relate to how u feel and have been treated by Drs,, family and friends...know u r not alone <3