(snipped for brevity)
My wife had panic attack issues for a while, bad enough that she couldn't actually will herself to go into the grocery store. She's also gone on some anti-anxiety meds which helped some, but she actually found a lot of help from doing regular meditation. She started by going to a studio for a couple of weeks and, once she'd gotten the hang of it, usually just does it in our bedroom for 20 minutes or so a day with a recording or app on the phone that she listens to over earbuds. Since she started doing that, I've seen her maybe get close on three panic attacks in the past couple of years, and in every case was able to identify it coming on and use breathing and meditation techniques to calm her mind down and get back to a steady state.
Definitely not saying it'll work for everyone, but her doctor recommended it and it worked great for her.