Accepted Answer

Thank you. As you suspect, this does indeed sound like a hypoglycemic episode. There are different causes, one of the most common is lack of proper nutrition (in a healthy individual, without diabetes). The best way to prevent this is small, frequent snacks.
You should have it checked out by a doctor because it may signify that you are having other issues.
The other possibility is that you had what is known as a vagal episode. This is when a vagus nerve activates due to anxiety or stress or pain or shock. It can give you the same effects but more prominent including fainting.

Here's a website with more information:
Hypoglycemia

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Expert:	Doctor G.
Pos. Feedback:	98.8 %
Accepts:	1001
Answered:	12/10/2008

Doctor (MD)

Internal Medicine / Cardiology / Endocrine questions