I would also find MEM to be a logical diagnosis, but even then - Dr. Bance does not think what I have is MEM. For anyone that does not know who Bance is... he is the absolute king of everything middle ear related:@Ben Winders, my honest opinion is this low drone, at least for some, and particularly for those that can stop it by plugging their ear, is that this is middle ear myoclonus - i.e. the tensor tympani or the stapedius muscle in spasm. Particularly if it stops and starts. More so if there is a feeling as well as a noise (i.e. a vibration).
Magnesium may help, as may Potassium, and if you were keen to explore muscle relaxants, that's an option too.
Manohar Bance is an Otologist/Neurotologist and clinician-scientist at Cambridge University, and the inaugural Professor of Otology and Skull Base Surgery at the University of Cambridge, UK. Previously he was the Professor and Head of the Division of Otolaryngology-Head and Neck surgery at Dalhousie University until April 2017, where he was Director of the EAR and SENSE labs in the Division of Otolaryngology. Manohar is clinically active in middle ear surgery, cochlear implants, middle ear implants, eustachian tube disorder, skull base surgery and vestibular disorders with research interests in cochlear implant stimulation strategies, middle ear reconstruction and mechanics, bone conduction hearing, Eustachian tube disorders, gene and pharmacotherapy for inner ear disorders, and vestibular disorders. He has held several research grants in these areas, and is particularly involved in medical device development and translation.
He has over 130 peer reviewed publications, is a board member of the Politzer Society, a member of the American Otology Society, the American Neurotology Society, the Triological Society and the Collegium Otorhinolaryngologica Amicitiae Sacrum anda Council member of the RSM Otology section. Manohar is also American sub-specialty board certified in Neurotology, and is an editorial board member of Otology-Neurotology, and the Journal of Advanced Otology.