You know, I have the same painful nervousness whenever I play in front of anyone at all. However, I also have MCd a lot of local events and during shows I usually do some stand-up between songs (you think playing MUSIC is unnerving!), and thatis KILLER on your nerves. However, when I get nervous and start shaking, I realize that I'm shaking because of my adrenaline rush that comes from being nervous. I just use that boost in energy to bring more life to my performance. Albeit, it is a painful experience for a little while, if you use your nervousness to your advantage and fuel your performance with it, you'll find it helps quite a bit.

Also, you could always take a shot or two of Jack Daniels before you go onstage, not enough to get drunk, obviously, but enough to calm down.