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So I was sitting in class and all of the sudden I feel weak, my heart starts beating really fast, hands get cold and sweaty and I feel fatigued and scared I was going to pass out or something. It just came out of nowhere, I wasn't nervous or anything prior to it. It lasted about 5-10 min, and it scared me. Now I feel fine but I don't know what happened to me. Could it be a panic attack, or something else?