I too have been having mysterious pain pressure in my upper abdomen feeling like a band around my chest. The pain seems to originate from my stomach, but no one seems to know what’s causing it. I did think it was anxiety and I am on hydroxyzine for that, but I am still, not sure because it comes on for no reason and even though I am on my medication.
🤷‍♀️ My symptoms are very similar to yours such as fatigue, Extreme shortness of breath, pain pressure in my upper abdomen. Sometimes I just get it like a squeezing of my stomach. Very difficult to tolerate. I hope you find answers.