i had the exact same thing last night. one minute i am surfing the web, feeling great & healthy, the next minute i am shivering so bad that my teeth started to actually chatter. i felt like i was in the antarctica in January. i immed. put on flannel pajamas (tops & bottoms), threw an extra blanket on top of my comforter, and crawled into bed. i just kept shivering and shivering, i could not get warm, even wearing flannel PJs and under several layers of blankets. i have never felt this cold before in my entire life. i finally turned on a space heater and i felt a bit better. i couldnt sleep much, when i did it was in fits & starts, interrupted by pain, and shivering and teeth chattering. i didnt even sweat for the first 3 hours. when i drifted off for half an hour or so (after 3 hours of pure hellish suffering), i woke up bathed in sweat, so i turned off the space heater, but i was still cold. six hours later, i finally slept a few hours, woke up feeling PERFECTLY NORMAL. i was totally fine, like nothing had happenend. i was just a bit tired, but no soreness or anything. i had no other symptoms other than a fever. if i had to guess, my fever was at least in the range 103 or so. i have never experienced a fever of this intense magnitude. and it was JUST a fever, nothing else. NO coughing, NO sneezing, no runny nose, no vomiting, no diarrhea, no nausea, no sinus pain, no ear pain. nothing but a huge monster of a fever. very weird. but i am 100% fine now, just curious as to why this happened (and happy it was so short-lived). something like this has never happened to me before in my life. is this common? the extreme sudden-ness of the fever's onset was quite strange, and even stranger was the quick return to normalcy.