[Sadrain]

But that's how your subconscious works - if you can go out, you will go there where there will be new people and stress (in the cases when you have been with the new people, sitting in the same class as them, etc. because it\s more stressful than just walking to shop and back). So - no moving, no stress. Which, of course, is not really true always.
Some people get this state so bad that they start to get these problems even when they just have to go out, like to shop or library. Even if their mind tells them it's all okay, they feel like they will faint or throw up, they feel like crying or other symptoms, depending on the person.