Getting dizzy

I am 212 lb and I just started cutting calories. Nothing drastic but may be 200 300 calories per day. I got so dizzy this morning when I woke up that I had to gulp up ready sugar foods and then I started feeling better. I had a 800 calorie dinner last night around 7 :30 PM. I had a carb high diet all these days. Could this be beacuse of that ? Any suggetions or how to avoid this ? Thanx in advance.

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