I've been feeling pretty crappy today. I worked anyway. This afternoon, while at my computer, I suddenly felt like I was going to pass out - dizzy, everything goes black, etc., so I put my head down and it passed for the most part. I felt a little shaky and weak, but figured I was OK. Then I got this weird feeling on one side of my head, not really a headache, but it felt like something cold was under the skin sort of, and within 30-40 minutes this strange feeling moved around to the back of my head. I felt sort of nauseous too. I told my boss I was leaving and I came home. The nausea is gone but the left side of my head still feels weird. Any ideas??