Shane is ready to break up with Kayla. He is extremely frustrated with her and does not know what to do. One of his favorite activities is to eat out and try new restaurants. Kayla, however, hates eating in restaurants. She has told Shane that she loses her appetite at the mere thought of having to eat out. When he pushed her for an explanation, Kayla explained that she is afraid that she might spill something on herself or do something equally foolish in front of other people. Even though she knows how frustrated Shane is with her, Kayla cannot bring herself to act any differently. What diagnosis would be most appropriate for Kayla's fears