That sounds like what happened to me when we went to visit Bruce's mom at the hospital after her hip replacement. I hadn't eaten ALL day and began to feel dizzy. I was sweating horribly but was shivering like I was freezing. I had to leave the room and go sit in a waiting area. I did not pass out though, thank goodness. I'm sure people would have thought it was because I was at the hospital. I am not afraid of hospitals like some people.

Definitely keep snacks handy and see a doctor as soon as you can. You don't want to end up in the ER without insurance either.