I'm so sorry. My son has a similar problem. He gets rather panicked when given a menu. I think it's having to make a decision that he finds difficult. We find that it's a lot easier to swallow (pun intended) if we tell him he would probably like two or three things and then, if he can't make a decision from them, we will suggest that he probably would like X.
So his problem isn't the same as yours, but maybe you could ask a couple of people what they fancy and tell them that that sounds delicious, you'll have the same thing.
Maybe it will take the pressure of making a decision off you.