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Its probably adrenaline. When your anxiety levels rise, your body goes into flight/flight mode and your adrenal glands ramp up the production. One effect is vasoconstriction to raise your blood pressure. As blood moves away from the skin surface it can make you feel chills and flushes. You notice it, feel more anxious, more adrenaline, etc. Its your body trying to keep you safe. You're not in any danger from it. Hope this helps.