Honestly I was just diagnosed with panic disorder and spent weeks in an intensive Partial Hospitalization Program and the thing that helped me the most....medication. Honestly I fought it tooth and nail but it got too overwhelming and it was preventing the therapy from actually doing its job. So I started medication 9 days ago and I feel so much more hopeful. I also learned a couple things you can try:
10 More Seconds - During a panic attack, tell yourself you just have to make it 10 more seconds and then it'll be over. You may have to do this several times, but the point is to calm your mind by putting a time limit and distraction in place.
Breathing Fingers - trace each finger on your hand. breathe in as you trace upward on a finger, breathe out as you trace downward
Ride the wave - accept the attack and all the symptoms with it as a wave...it can only go so high and it's gotta come right back down. ride it until it comes back down

Hi, i can relate as one who has and has suffered with Panic Attacks for some years now, it's horrible when they spin out of control. I try and tell myself this will pass and you'll be fine but when they are happening it's not so easy. I do deep breathing or listen to music to break it up, anything to divert mind mind. I know why and how come i get them but when they happen it's not as easy as it sounds, until i finally calm down, I also use a gigit figit to help me think of something else, like how long will it spin before it stops. Been in the hospital on occasions because of it, once they give me meds through an IV i'm much better but it takes it toll, later i feel like a wet noodle,
Keep well feel better, reach out if you like,
Gary