Consider keeping a few ice packs at the ready in your freezer.
If you feel like an attack might be coming on, place a couple against your lower back while holding a few more in your hands and you’ll likely notice relief from the stress and anxiety that is coming over you.
By doing this you might notice immediate relief as the tightness and tension in your upper body moves down to where the cold sensations produced by the ice packs are centered.
After a minute of this you can move on to some slow breathing and within a couple more minutes the panic and anxiety will likely to have passed!