In my opinion, it is something you should acknowledge. I'm sure just writing about it here helped you get some relief. It seems you react normally to a high stress situation. It is not easy to control how we react physically sometimes. Perhaps with practice you can handle situations a little easier. Breathing sounds easy, but if we can concentrate on it at times of high stress it can give us that extra oxygen to help our minds function better at the moment. In through the nose, deeply, out through the mouth, fully. Use a mirror to practice what you might say to that important person. Do it over and over until it is effortless. try to video your self and watch it until you feel confident. Work on your posture and speaking skills. Get a book about speaking and nervousness, maybe. Stay, hydrated and get your rest always helps before big events. Hope these tips help.