Hi Katie,
My name is Vikki, when I get an attack it lasts for ages I'm not just exagerating sometimes the whole night, it makes me want to scream (and I have) I have also had attacks that only last a few minuites but these tend to be during the day, night time is the most difficult time for me,I understand what you mean about them lasting ages, Once a Dr asked me how long the attacks lasted and when I told him he said maybe it feels like that, but no way most nights it's dark when I get it and light when I start feeling better, so I really can relate to you, because as horrible as panic is if I thought it would be over in ten minuited, I would be able to deal with it better, but it is the fear knowing that it will last for ages.
I wish you all the best and remember you are not alone in this
best wishes
vikki