"I know I can, I know I can". Although this has nothing to do with my panic attacks, quite a few years ago I had a sudden urge to start jogging. It was really tough at first as I had gotten out of shape. I was frustrated I couldn't make it around the track without stopping and one day I kept saying to myself, "I Know I Can...I Know I can" and convinced myself not to stop until I finished a lap.
When it came to my panic attacks, it was so tough to go too far from home, it was debilitating!! If I went out, I kept saying to myself "NO FEAR...NO FEAR...NO FEAR"... it helped a bit but those panic attacks really play tricks with your brain. I really got fed up with it, went to the store, started to have those panicky feelings and despite them, I walked around the back wall of the store 3x. When I went to the register to pay, I was still panicky and once I got home I felt much better. I realized that I could fight it. I may not feel 100% comfortable with it but again, I could fight it.
Be patient and keep at it. Fight it as best you can.
Dave