Reya, a 20 year old female, experienced a panic attack unexpectedly while driving over a bridge on her way to work about 2 months ago. She adjusted her route to work to avoid that bridge, however, she experienced another panic attack out of the blue while driving to work on her new route. Since that time, she has experienced three more panic attacks, one at home, one while driving, and one at work. Reya lives in fear of having another panic attack, and tries to avoid driving because she worries it will trigger a panic attack. Which diagnosis would best fit for Reya?