Hi and welcome to the Chiari forum.
Not being medical professionals here, we can suggest your MRI looks like ours and yes,m it appears you may have tonsils creating a CSF obstruction.....
What you need now is to find a true Chiari specialist....there are a few in TX, but not be in your immediate area....many of us do have to travel to get to the right Dr....
Also, educate yourself as much as you can about Chiari and ALL related conditions as they can affect how you feel and heal post op should you be a surgical candidate....Drs that claim they can "cure" or "fix" you...run...get away from them as there is no cure...only surgical treatment to restore CSF flow...so a CINE MRI to check CSF flow would be the next testing....surgery will also slow progression....many with a CSF obstruction may develop a syrinx (Syringomyelia) to help prevent one from forming if one is not present is restore flow...if one is present, by restoring flow, many times a syrinx will shrink....many times they will choose to watch it to see how fast changes are occurring to see if surgery is needed sooner rather then later...symptoms are also an indication...
Here is the link for our Drs list....keep in mind, this list is not a referral nor an endorsement for those listed on it, but it is a starting point for you to research Drs....
http://www.medhelp.org/health_pages/Neurological-Disorders/DOCTORS-LIST-FOR-CHIARI-SYRINGOMYELIA/show/1062?cid=186