Jill is at the grocery store. While there, she starts to swe…

Jill is at the grocery store. While there, she starts to sweat, her breathing quickens, her heart starts beating very fast, she becomes nauseous, feels lightheaded, and she experiences chest pain. She feels as though she is going crazy. After this episode, she is fearful that it might happen again, so she avoids going back to the grocery store. What diagnosis does this mostly closely exemplify?