@Mattv Careful chiro treatment should help. Treatment beyond this can be debatable. For me, head position to neck will give some temporary relief - such as proper neck placement when sleeping.
Much of somatic problems includes certain C discs depending on conditions. The upper C discs relate to jaw and facial, although facial is complicated. Also spinal nerves, deep cervical nerves, cranial nerves, vertebral arteries, 5th cranial nerve. All neck muscles, the SCM is the biggest player.
I have posted these links before, so I will give an address. 3 sites below: The first is an important read for physical T. I think that it's the best overall source.
Charter 4 Cervical Spine Trauma
Causes of the Mystery Ear Pain
(this site goes into your title post of thread)
Sternocleidomastoid Muscles: Affects Head, Eyes, Sinus, Ears, Throat, Pain, Dizziness, Whiplash