Look, I'm going to give you the same advice I give to anyone in a desperate situation like this: try meditation. I know a lot of people view it with skepticism but it really does allow to adopt whatever state of mind you choose. And in your situation, I doubt you'll miss the 20 minutes required to try it. Can't hurt anything, but it can certainly help a lot.
I'm going to direct you to [url=http://www.learningmeditation.com]Learning Meditation Home Page[/url]. Each person is different but in the "meditation room" link I found the one that helped me the most was "Discover your Inner Guide".
If you feel it's beneath you I suggest you practice your poker face, but I'll tell you right now that if you're going to fall to pieces just being in the same room as him it won't matter how much you practice keeping your face impassive. It'll show in the rest of your body. Which is why I'm recommending meditation. It gave me incredible strength in dealing with my ex.
Time is a great teacher, but unfortunately it kills all its pupils ... - Louis Hector Berlioz
Gene Police: You!! Out Of The Pool!