my friend has relentless right ear pounding too, initially diagnosed as pulsatile tinnitus, but after a CT scan was determined to be mastoiditis (though she cannot remember having an ear infection and has no pain with the pounding). Hopefully the antibiotic will take care of it and that you are better too!
Understudy definition, to learn (a role) in order to replace the regular actor or actress when necessary. See more.
Under color of authority is a legal phrase used in the US indicating that a person is claiming or implying the acts he or she is committing are related to and legitimized by his or her role as an agent of governmental power, especially if the acts are unlawful.