Hi

By far the best thing you can do is deliberately expose yourself to anxiety when you're out somewhere relatively local and just let it happen. It's the attempted avoidance of anxiety that's actually the biggest problem, not the anxiety itself. Next time you have one, keep telling yourself you KNOW it's not dangerous, that it's not going to kill you etc. These are called mantra's and they are incredibly effective over time. It takes practice, but accepting anxiety is at the core of all the most successful treatments like CBT. The mistake most people make is trying to find a way to stop panic attacks, and you can't. The paradox is that once you start accepting them, they will become less and less frequent and eventually happen rarely, if at all.