Most Helpful Guy
You must see a doctor. This could be low blood pressure, low blood sugar, or many other things. I don't want to alarm you, but it could even be a "petit mal", a form of epilepsy. If you were watching something with a lot of flashing lights or fast moving action, it could be photosensitive epilepsy.
Most Helpful Girl
You need an ambulance girl not G@G - you could be malnourished, dehydrated or suffering from something else that no one here can determine.