I have had this happen twice over the past week. Around 10:30 in the evening, I start getting extremely hot and my skin turns red all over. I feel as though I have an extreme sunburn, My skin even tingles. My heart beats extremely fast too. I lie down and place cold wet towels on me and I take an antihistamine, and about an hour later the systems go away. What is going on? Is it some type of food allergy?