I recommended to you that you practice abdominal breathing every day and see if you can shift your whole pattern of breathing. I think you will find it makes a noticeable difference.
Firstly, sit in a chair or in a Seiza position on the floor (sitting on your legs) or cross-legged on the floor if you find that comfortable. Keep your back straight (don’t lean back on a sofa!) and then put one hand on your chest and one hand on your abdomen. Start off with chest breathing. Breathe in, expand your chest then as you breathe out, relax. See how that feels – breathing with your chest keeping your abdomen still. It probably feels quite easy and natural.
Now add breathing with the abdomen. You may find it quite difficult. You can breathe a little bit with your chest but try using mainly your abdomen. As you breathe in it’s like bowing up a balloon – imagine the air comes in below the navel. As you breathe out and relax, gently squeeze the abdominal muscles to help expel the air. Do this a few times – breathing in and relaxing, then gently squeezing the abdominal muscles. You’ll be able to see the abdomen moving and the chest not moving as much or at all.
You can breathe through your nose or your mouth; it doesn’t really matter.
After a minute or so relax and see how you feel. Do you feel calmer? Do you feel more connected to your body or more energised? Or if you are tired do you feel a bit more sleepy?