Why do I hear squeaking or grinding in the back of my head or neck?

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This is caused by inflamed cerebellar tonsils.   This can cause central sleep apnea.  I believe it is from haemophilis bacteria, killed with cinnamon essential oil taken internally.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://pdfs.semanticscholar.org/55ab/97205dc72aed34c19e2b1a3a98ea3f3b6f99.pdf&ved=2ahUKEwjsrMeu89vfAhVF4VQKHTBIBtUQFjAPegQIChAB&usg=AOvVaw02KcBJQWnshOOUjM-oko4y

cerebellar tonsils
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4260072/

https://mayfieldclinic.com/pe-chiari.htm

tuberculosis cerebellar tumor
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3864413/