
Suggest Ways To Rule Out TIA

Could be TIA, needs urgent attention.
Detailed Answer:
I read your question carefully and I understand your concern.
Those episodes do sound worrying indeed. While the first could have been maybe attributed to the vestibulary problem, the other episode with the inability to move, the speech issue is not justified by the inner ear issue. As you yourself suspected it might well be in the setting of a lack of blood supply to the posterior areas of the brain, a stroke or TIA in that area.
A stroke in those areas is among the most dangerous ones, as there is a concentration of many nerve pathways and nuclei responsible for vital functions. A stroke in those areas could be catastrophic. So even more than with other types of stroke, urgent attention is needed. I think he should be evaluated in the ER and undergo brain imaging, preferably MRI which best visualizes those areas. Imaging of the head and neck vessels is also indicated for severe narrowing which may be responsible for the low blood supply. Hopefully nothing will turn out and it is due to the vestibular issue, but no chances should be taken when there is such a risk in consideration.
I remain at your disposal for other questions.

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