Stomach distension causing discomfort breathing problems. what is cause? anxiety, breathing too much, stress. did not have before this year

Cramp of diaphragm: The primary muscle that helps us to breathe is the diaphragm and attaches along the ribs from the chest to the spine and lays over top of all organs in the abdomen. The diaphragm, like all muscles, can fatigue and cramp with over use or tension. When you become distressed either due to the pain or tension, this causes you to breathe harder. This adds more stress on the diaphragm.