Hi. Thanks for your query. Noted your history of sudden dizziness for several years, 2 MRIs, ENT consultations, lasts for few seconds but severe enough that you may yank your head to the side, there is no pain and quit driving; disturbed the life due to this. Precautions: You have stopped driving is the best decision you have taken. Do not be alone near the water body or fire. Never climb up or down alone. Do not keep a latch on bathroom doors. The probable causes in spite of 2 normal MRI and ENT consultations can be: Hypertension spells Cervical spondilitis, vertebral artery insufficiency. Medication for prostate and so on. You need a detailed clinical evaluation, examination by a Neurologist, yet better is the Neuro-otologist if availble in your area. This will help to evaluate you for proper diagnosis and treatment. Few more investigations that I would suggest are: MRI of the cervical spine, and Angiography of carotid and vertebral and brains arteries. Cardiac check-up. To check with any medications that you might have been taking. I hope this answer helps you to get an early diagnosis and have proper treatment so that you can drive again, become stress-free and have a great life.