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Thanks for your question.
There are many causes for vertigo. One of the most common cause is benign paroxysmal positional vertigo (BPPV) which may cause brief episodes of mild to intense dizziness which is usually triggered by specific changes in the position of your head.
Another cause is Meniere's disease which is a disorder of the inner ear that can cause spontaneous episodes of vertigo that is a sensation of a spinning motion, along with fluctuating hearing loss, ringing in the ear (tinnitus), and sometimes a feeling of fullness or pressure in your ear.
Your ENT doctor may do various investigations to diagnose the cause for your dizziness.
Your present symptom is less likely to be due to post concussive syndrome. However your doctor may investigate further with imaging tests if he/she suspects this to be the cause.
Thanks for your reply.
If your dizziness symptoms started after the accident then this is likely to be due to the complications from the trauma. In postconcussion syndrome which occurs 1 to 3 weeks after a head injury, there may be marked dizziness, headache, emotional lability, fatigue, anxiety and, possibly, vertigo. This dizziness and other symptoms are intensified by mental or physical stress. Though this syndrome may persist for years, however symptoms will eventually abate.
I would suggest that you consult a neurologist as well.