I've seen it, panic attacks just "happen". Others wonder what's going on, but only deep in the brain of the person with a panic attack feels the feeling. Panic attacks are all due to different feelings , and no two can be said tro be "the same". It is a strange phenomenon. One can be alright one moment and panicky the next. I think it's like dying, one moment life will go on forever and all the "bugs" will be resolved and the next minute one loses "control" completely, like it was their last minute on earth and they have to deal with it all alone. Very freaky, and very poorly understood , by anyone. cs