My wife is having breathing issues.

My wife complained about severe pain a couple days back and then she felt difficulty in breathing. We rushed to nearby hospital. She was able to breath only about 10 to 15 %. They suggested to go to big hospital. I rushed to another hospital very quickly. She was about to die but doctors put her on oxygen and she started to breath normally after a few minutes. But the pain still continue for almost 1 hour. They did xray, ultrasound, cbc and lipase. Everything was normal. They discharged her from the hospital. Next nyt she started to complain about breathing issue but she became normal within 5 minutes. Today morning same thing hppened. Is this a very big concern? She forgets things very fast and sometimes she is like shaking and she gets shocked for a moment when we wake her from sleep. Some psychological disorder is there I think. Plz suggest why she is having breathing issues. She never had breathing problems, not even at the time of covid. She did never have asthama. suggestions plz