What stomach problem causes loud rumbling and gurgling, worse when sitting, is in the upper stomach and feels like heart pain but cardiac workup norm. The pain is like a stabbing radiating pain middle.

peptic disease. Peptic disease with nervous air swallowing would cause these symptoms.
Reflux esophagitis. This is only one of several possibilities. Suggest you go and see a gastroenterologist and be fully evaluated. This is likely to be quite manageable and will relieve you of much distress. Good luck.