My face is incredibly hot. It feels like I have a sunburn and it's just burning. The last two days at work, I've had to open my window periodically to get some cold air. However, most of the time, I am very cold as the boss that I work for doesn't like the temperature being up, so it's always a little chilly. But, like I said, I've had to open my window a few times because I get so warm that I start to feel very faint. I don't believe I have a fever, but I'm really not sure. I've been eating a clean, healthy diet, drinking tons of water (at least 7 cups a day), and been working out. What could cause this??