It most definitely is. And if you think about it really makes sense. When one has a terrible attack, feels anxious etc..when they are out but doesn't when they stay home over time it will be more adaptive to stay at home, hence - agoraphobia. I used to get dizzy if I just left the door when I first was diagnosed with anxieties. I would hyperventilate and strangers would call ambulances. It can get really bad, so if you are finding yourself anxious when in class and generally out you really need to find ways to calm down when in those situations. I get the exact same thing, and now that I am in medical school I don't have the option of leaving. It makes things really uncomfortable for me and the people around me (they probably think I am crazy sometimes). Next time this happens, recognize what you are doing, what signifies your anxiousness (nail biting, tapping foot, fidgeting etc...) when you see it starting, excuse your self and go to the bathroom or take a small walk away from people. These gestures are ways in which emotions suppressed begin to manifest themselves. Think of it as your body saying I am sad etc... pay attention to me. In the bathroom I will take deep breaths and calm myself down so I can reenter the room. If you can find a safety person you can call too I find that helps. I call my ex boyfriend who I am still very good friends with. I just call and say I am scared, and just telling someone that sometimes is enough. Remember anxiety is one of the only psyc disorders that truly represents repressed emotions, once you recognize that simply asking your self why am I upset today can start the calming process? Sometimes a good cry is all it takes. We are repressed but very emotive individuals. I hope it gets better for you....