I went to sleep feeling a little nauseated and woke up an hour later feeling like I had just been dipped in ice cold water. I am 17 weeks pregnant so the nausea seemed to be explained but this is painful. The cold is so painful I can't get out from under my covers. I don't have a fever and I feel warm one minute and then shivering and painfully cold the next. It's intolerable. I have felt this before and I had a uterine infection. Any idea of what this could be?