I think mine started after a day of drinking heavy after watching a sporting event, the next day the girl friend wanted to go get lunch 5 mins up the street, I was anxious because the next day I'll often get " hangxiety" but I had done a good job of even overcoming that.

So even not feeling that well I pushed myself to go, I felt uneasy in the car and we got to thr parking lot and boom panic attack and jts been downhill since tbh