Sometimes while sitting or laying or exercising i feel like sudden hollow in uppwr chest and i feel likw something is blocking so i burp. I also have heart anxiety so i did echo and ecg and were normal. My heart rate at resting remain 50-60 but while exercising goes to 130 and i hear pounding. Then it goes away. Also i feel thi tingling type tightness in lower jaw to neck and upper chest. Is this muscoskeletal. Cause i have back and shoulder pain sue to spomdolytis. My echo and ecg normal 3 months back.