Sorry to hear that the get together is causing you so much anxiety. Have you told any of your family about the anxiety that you are experiencing? It may help to have an ally in a group even if they dont fully understand what you're going through. I know it can be difficult to admit to having these issues sometimes.

I understand the frustrations of not knowing why you're feeling this way, its a very unfortunate side effect of anxiety and one that picks away at your self esteem.

Hope things go well for you.