Do you have any physical habits when you're talking to others? For instance, when I'm talking with people, I have an unconscious habit of rubbing my chin. I feel uncomfortable if my hand isn't up there.
So what I do when I want to be more overtly aware of my actions, I force myself to keep my hands in my pockets. This makes me very uncomfortable, so I am consciously aware of everything I'm saying/doing.
Maybe you could find something like this that would physically engage you in the conversation and keep you aware of your speech?
Just a thought
