When i had anorexia, severely underweight, i had a piercing. i passed out while lying down. when i woke up i could barely move for about ten minutes,severe tingling in my arms, shaking and lot of sweating. still wonder what may happened in my body?

Hypoglycemia or low blood sugar would be first condition that comes to mind with others such as dehydration and/or hypotension likely to have contributed as well. Syncope is in medical terms passing out or fainting and that can be precipitated by fear, severe pain or emotional distress among others.

Anorexia can be a severe condition with life-threatening or serious medical problems. I recommend seeing your primary care doctor to get a referral for a specialist in this area, for specific care.

During your syncopal episode your blood pressure dropped significantly and your heart rate most likely slowed down from excess vagal tone. These occurences caused a reflex outpouring of adrenaline which caused those postsyncopal symptoms.