If it was me I'd certainly pursue it until I found out why.
Blood sugar comes to mind- requires tests to know for sure. Some people drop like a brick at the sight of blood or needles or when visiting someone in the hospital. It could be caused by a lot of things however, not just my off the cuff suggestions.
The trouble with fainting is it might not kill you but if it happens while driving or if you hit your head on something...pretty dangerous.
Edited by QuiteContrary, 05 September 2012 - 03:51 AM.