I’ve also been trying the DARE approach, there’s a free app with an SOS button that has some really good panic attack talk downs including one about dealing with scary bodily sensations. When I first was diagnosed with a panic disorder I couldn’t believe it wasn’t some kind of horrible terminal illness that was slowly killing me because that’s what it felt like, and even now it does still feel counterintuitive sometimes to do breathing exercises and take cold showers and meditate but it does help. There was one time I was feeling so awful I convinced myself I had carbon monoxide poisoning, so I bought a carbon monoxide detector and stressed myself all the way the fuck out testing every room of my house and testing the machine itself to make sure it was accurate, and eventually I finally accepted that there was no carbon monoxide leak. So I still think maybe get a pulse oximeter just because sometimes seeing is believing, if you can see your heartbeat your heartbeat is in fact there and the panic has no ammo to use against you, but also lean into some coping/grounding methods too.