You have had appropriate brain imaging to rule out many of the major neurologic disorders like tumors or masses.
Further testing like hearing tests (looking for things like Meniere's disease) and vestibular evoked myotonic potentials (looking for superior semicircular canal dehiscence syndrome) can be considered for further evaluation.
An evaluation by a physical therapist and ENT can be considered to look for benign positional vertigo. You can ask them to perform the Dix-Hallpike maneuver which can confirm the diagnosis.
These options can be discussed with your personal physician, or with the appropriate specialist.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_