What Causes Severe Fluctuation In Body Temperature Followed By Dizziness?

last night at ten I felt extremely hot. this lasted for a few hours. then I felt really dizzy as well. I went to bed around 3:00 my husband got my my paxil to take just before bed with some cold water because I was so warm. I wasn't sweating though. I sat up and passed out just from sitting up. I felt extremely dizzy and confused for a few more minutes. I fell asleep for one minute. during that minute I dreamed about a cold place. I woke up and was shivering uncontrollably. i warmed up to normal. but thought it was odd to change from extremely hot to cold in a matter of seconds. I wasn't dizzy anymore. I got up this morning and walked into the kitchen where dizzyness overcame me and I passed out again. whats wrong with me?