Don't try this at home

Okay, so I'm pretty sure I almost set my hair on fire today. Not good. I was round-brushing my hair dry trying to style it, which I never do for multiple reasons (the first being time, the second being that it kills my arm), but I decided to today because I have a new haircut. Everything was going normally until a big chunk of my hair turned a caramel color where I was using the brush and blow dryer. I immediately turned the dryer off but not in time to rescue my hair--tons of singed strands fell out and filled the sink. (This is crazy, I know.) So, that was the end of the round-brushing. A little vent thingy fell out of my hair dryer several months ago, and not thinking it was important, I threw it away. Well, I think that thing is what makes the hair dyer not get too hot and do what it did to my hair. Thankfully, I have a lot of hair so I don't think it's noticeable, but then again, I can't see in the back! Will you tell me if you see me and I have a bald spot???