Hi and welcome to the Chiari forum,
Your DX of SCD does have many of the same symptoms of Chiari.....and there are even more conditions that share those symptoms along with Chiari....MS, lymes, lupus....
Chiari is often times over looked as a incidental finding....it is possible many of us do have SCD but it is not been the focus as to the cause of our symptoms.....once Chiari is found and you have a Dr well informed and experienced with Chiari they tend to rule out ALL related conditions.
I do not know if you are able to get copies of your MRI to send to Drs for review.....or even your OR report to know for sure if your brain was retracted too far.....but it may help give answers as to if you do have Chiari.
My question is what part of the brain was retracted?If it was the cerebellum and it was herniated already, pulling it up and stuffing it into a too small compartment ( skull malformation that denotes Chiari is present)
I do hope you are able to get answers.....I am adding a link to a very small list of Drs from Australia for you to ask more questions to-