Passing out after blood test

Patient : I am not afraid of needles. I have also had many blood tests in my life. But yesterday I had a blood test with 4 viles and I got really sweaty and almost passed out. They had to give me a drink, ice on my neck, and put my head down for 10mins. I am usually a nervous person but I wasn't nervous for this procedure. Why did I almost pass out?
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