I found some useful information on Costen’s Syndrome.
Manifests with several symptoms that can be divided into auricular, articular and cranial. The joint is sensitive to palpation, with pain and crepitation. Hearing is poorer with buzzing in the earsdizziness and headache around the eyes, the crown and the back of the head.
Today it is considered that only arthritic changes and neuralgia are realistic, and possibly certain auricular symptoms. One explanation for this condition is that these changes are preceded by loss of posterior or all teeth, during which the bite drops and the mandibula moves distally, pressing the joint (glavicom) discus articularis and posterior part of the joint chamber. The pressure causes the disk to deform and shift, so that it no longer protects the arch and posterior part of the joint chamber from nerve pressure. This causes irritation of n. aurikulotemporalis, which is most probably the cause of the headaches on the crown and back of the head.
In 1958 Freese gave a new explanation of the syndrome. He based his explanation on “trigger” centres. Namely, he considered that hearing disorders are caused by a “trigger” point in the masseter, dizziness a “trigger” point in the sternocleidomastoideus, and pain in the tongue and pharynx spasm of the geniohyoideus, digastricus and pterygoideus muscles.
This information is from http://hrcak.srce.hr/file/17589