It's not about size it's about symptoms and it sounds like that brain of yours is damn well crushing your spine into a curve. Where are you located?
Hi and welcome to the Chiari forum.
It is sad to say, but so many of us are made to feel like that...like it is ALL in our heads...and it IS just NOT the way they mean. We refer to this treatment as The Royal Chiari runaround....
You deff need a true Chiari specialist to help you....know not everyone with Chiari is a surgical candidate....and that related conditions can cause many of the same symptoms....
Not sure what they mean by the tonsils are not enlarged enuff....it is not the size of the herniation but if they are creating a CSF obstruction and the symptoms you have and how it is affecting your over all health...
Send copies of ALL MRI's and reports to a true Chiari specialist to get another opinion...
Know you are not alone....and you are not crazy.