What to do with my brain?

so the protrusion of the right cerebellar tonsil in my brain is only 3mm going into the foraman Magnum. They say it is not Chiari 100%. Is it possible to still have Chiari or do I have to take what they are saying as true? I have not yet had a cine mri. Surely a headache, neck ache and all the usual Chirai symptoms surely has something to do with the protrusion?