Thanks for consulting ATD.
He may be having Transient ischemic attack, Syncope, Hypoglycemia, etc. It is a type of medical urgency and he requires medical attention as soon as possible. Do no wait for an appointment and rush him to ER/ED. Meanwhile, check his blood pressure and blood glucose levels and administer medication that he has been using.
Hope this cleared your query and wishing you all the best. Have a nice day.
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