Freak out because my computer is over 5 years old and the battery lasts about 30 minutes. And I can be triggered by a lot of small sounds so I rely on headphones+ ipod or computer to help drown out the noises so I can be panicky if I think/know I don't have that as back up. Sometimes getting my ipod on in time has been the difference between just feeling very tense and angry and a full blown panic attack with hyperventilation.