Could be normal: Feeling suddenly tired after one has had a large meal, had an argument with someone, just engaged in heavy physical exertion, or having stayed up all night or gotten less than 1-2 hrs. of sleep that night is well within physiological expectations. It's the body's way of tripping the circuit breaker and making you shut down for awhile so it can recharge. Itchy? That's mast cell degranulation.
Answered 11/28/2014
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