Do you get panic attacks? If so, what do you do to stop them after they've started? Or to prevent them? Without medication.

I’ve been getting panic attacks ever since I was a little girl, but they’ve gotten a lot worse in the past few years. I started getting them every day, sometimes several times a day. I was perscribed both Xanax and Zoloft. I refused to take the Zoloft and stopped taking the Xanax about a year ago. Now I’ve been trying several different methods to calm myself down once the panic attacks start. I dont’ get them as often as I used to, but I do still have them. I use breathing techniques, exercise and meditation. Any other suggestions?