Last night, all of a sudden after watching a movie I started to feel very cold and was shaking and I went to bed and even under a thick warm comforter I was still freezing. I had to use the bathroom then and it was so hard to sit on the cold toilet seat and I was still shaking. I felt a high fever. I came back to my room and put on a pair of thick socks and got an extra comforter. I laid there under 2 heavy comforters with thick socks on and tried to sleep and all I remember is stuttering and shaking and feeling so fatigued. I then woke up around 7am and had a terrible headache and was slightly sweating. I drank water, took 2 advils and went back to bed. Woke up around noon feeling fine, just a little lightheaded. What was that all about?