I know what you mean. The more people that I tell, the easier it gets and the more liberated I feel! I hate lying and people sometimes ask more and more questions depending on what I say I can't eat.
So at my BF's family's place last weekend I told them that I have IBS. They kept asking why I wasn't eating the cheese, then the salad, and then the desserts. It was so much easier saying that I have IBS and they have no idea what that means so they just let me eat what I knew was safe. YAY!