Simple. Stop talking to your boss.
The SSRIs like Paxil work to help social anxiety. They have helped me a lot. I don't feel any anxiety talking to people anymore. Beta blockers like Propranalol help with panic attacks. Talk to your doctor about what's best for you.
You have to work on your self-esteem... also try picturing your boss in his underwear, it'll make him seem less intimidating. :-)
easy answer, you have no self-confidence.
Random people online cannot cure your anxiety. See your doctor.