When I go to start speaking, I sometimes hold my breath involuntarily. I've nearly passed out from it in the past, usually when in groups and I really want to get my words out. On the other side, I sometimes talk too fast and then feel I'm suffocating. Also, mirroring some other comments, when I have to speak too much for what's normal, I sometimes either start to get a headache or - I don't know how to describe it - like, a little vibrating in my teeth. It's really strange and odd to describe.