I got up 2 hrs earlier than usual; had breakfast, coffee, cereal, banana; went to my desk & did paper work till 2 pm; was tired, walked to bedroom to take a nap .... I was so cold my whole body shook, I put on heavy sweats and a blanket, took a regular asprin it seemed like a long time before I stopped shaking,... wook up at 5 & feel fine ....... what happened?????