This morning I blacked out briefly

I got up this morning and did 30 miutes intense cardio exercise. I drank 2 c. water beforehand. After taking a shower and getting ready for work, my vision went black for about 20 seconds and I still feel a little lightheaded an hour later. Anyone have this occur and know if it is a sign of dehydration or something else I should be concerned about? I plan to call the dr. when their office opens later.

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