Hi welcome to HCMForum. The condition you have described max be due to hypoglycemia
lack of electrolytes or may be some thing else.
I advise you to take him to the general physician and tell him about the diet also. And take the advise to prevent such attack to occur.
You see that the ristrictions of diet may not be very strict. Give him salads to prevent electrolyte defeciency. give him fruits and juices
to prevent hypoglycemia. Thank you.