I experience the same thing. Unfortunately, I have not found a direct cause. Low blood pressure can cause lightheaded and dizziness, but if the water is too hot and you turn it on cold for a few minutes, it will not help. I found laying down as soon as I feel dizzy helps, and also tucking your head between your knees is good at making the dizziness go away.
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I feel light headed after a shower too, sometimes.
I've read it's because of to hot of a shower and to cool down the water or put a fan on, but I always have my fan on... I usually try get out of the shower ASAP if I tend to feel light headed and sit down for a minute or two, and then I feel fine.