That is an interesting point, samstead, I guess it is different for everyone. It is easy to think everyone's definition is the same. I never had trouble breathing. I just felt "fear" for no apparent reason and my evaluation of the difficulty that every day challenges presented was exaggerated. I'd rather face a mad bull than ever experience that again, at least then I would be able to identify the source of the fear - and the duration would be short lived. :)
OP, is there any way you could get treatment for it? Combining medication with therapy is best, but even just medication would help.