@bonniethompson1234 yes, I had to concentrate on the belly breathing for a few months, before it became natural to breathe that way. Now I do it without thinking - except on the (now rare) occasions when I feel a panic attack coming on. Then I start walking up and down as I concentrate on the belly breathing and telling myself that I have got through this before and can do so again.

There is also these techniques, but I think with this you really need someone with you to walk you through the “5, 4, 3, 2, 1 exercise. I know I couldn’t think clearly to remember the 5, 4, 3, 2 and 1 formula when on my own. Some people perhaps could, though. Here is the link for the techniques:
https://www.medicalnewstoday.com/articles/321510#methods