Heat exhaustion? What is it?

I woke up at 6:30 In A sweat sick to my stomach. My roommate had turned off the fan and even though it is 49 outside we have no control over the heat. All my roommates know I need it cold but I woke up, not from the heat itself, but because the heat actually makes me wanna throw up. I wish I could but I found I can no longer make myself throw up due to doing so on many occasions due to illness. I need to talk to my roommate and set up... something, maybe by more fans idk