From personal experience, years ago : learning to control your breathing is the key. Your fear of the symptoms can turn it into a self-fulfilling prophecy. When you've deeply internalised the assurance that you can defeat the symptoms any time you like by regulated breathing, you might well find like I did that they just stop happening quite naturally. It takes time and practice. Sometimes now when I find myself in s…
This works unless your anxiety is being triggered by the vagus nerve in which case deep breathing only makes it worse. Had one related to an illness recently, the vagus nerve makes you feel like you are having terrible anxiety that is made worse at the apex of every in/out breath. Then when you can't breathe deeply you start having even worse anxiety. This is the problem I am dealing with atm.
Turns out I had a pinched nerve in my spine. The pain and nerve stuff caused my body anxiety sensation, which then caused the emotional anxiety.
Resolved with a lumbar fusion.
Which explains why most of my prior efforts to mitigate weren't effective (drugs, meditation, exercise, sleep hygiene).