One of my students did a compare/contrast essay about Generalized Anxiety Disorder vs. OCD. She made a good point that people with OCD at least have the relief of knowing exactly what they need to do to alleviate their discomfort -- they clean the thing or check the lock or straighten the picture. With anxiety, you don't know what the problem is, just that there might be a problem, so it's harder to figure out how to address the situation effectively.