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I do not mean to alarm you, but I do not think that is normal. I would call my doctor right away. It's better to be safe than sorry.
i had the same thing happen to me when i was riding on a bus, i began to sweat bad and started to get blurred vision, and then i passed out apparently.My doc told me it could be several things:Weather outside if its too hot,Not eating before you head out somewheregetting up to fast andcould also be low blood pressure, which for my situation thats what it turned out to be. but like the comment ahead of me, talk to your doc just to be safe!