You are only being interrupted once a day or every few days and they bothers you to the point of throwing things, yelling at people, and calling them names? Fantasizing about shooting them? Seems like a bit of an overreaction and is rather disturbing. Are you in the care of a psychiatrist or therapist? I hope you will consider seeking help for you anger issues.

Put a sign on your door for the particular times you definitely do not want to be disturbed, but the reality is, you live with other people. You will be asked questions, asked to do things, etc.