what cause you to be light headed after you have blood drawn?
A couple of years ago I had a bad experience after having my blood drawn for a lipid test. I was healthy, but because I fasted too long (12-16 hours) and didn't drink water, I got extremely light headed and weak. My blood pressure went down real low and I had to put my head between my knees and drink juice. I... show more A couple of years ago I had a bad experience after having my blood drawn for a lipid test. I was healthy, but because I fasted too long (12-16 hours) and didn't drink water, I got extremely light headed and weak.