Welcome in H.C.M.
I have gone through your query regarding pinching deep pain in left ear, left eye and left sided headache. Though you are already in the touch of doctors and your M.R.I.brain did not show any abnormality and your hearing tests are also normal.But as you are saying that you feel dizzy on bending your head, this is now an important finding as it signifies the involvement of cerebellar or vestibular system
Considering above facts you should be investigated for-
1- Cervical spondylosis
2- Ischemia to balancing system.
Therefore I would like to suggest you to consult neurologist
for thorough examination and necessary investigations to pin point the diagnosis and treatment.