Could hiatal hernia cause sob, palpitations esp after food, sunsternal pain radiating through to back? very debilitating. all cardiac diagnostics nad

Yes: This is particularly true for large hiatal hernias, known as paraesophageal hernias. The diagnosis is generally made with an upper GI contrast study, but you may need other tests. The only treatment is surgical repair, and i would see a general or thoracic surgeon with extensive experience in laparoscopic paraesophageal hernia repair. This diagnosis is often underestimated by patients and doctors.

Anything is : Possible, but it doesn't sound like symptoms of hiatal hernia. Possibilities are hypoglycemia, pancreatitis, gallstones. Get an opinion from GI specialist.

Esophageal spasms : Can be just as debilitating. It is also very important to ensure that this is not due your heart. Do discuss all these with a cardiologist or better yet an internist or primary care. Best luck to you! in addition, the best heart test is multifunction cardiogram, as your cardiologist about it: http://en.M.Wikipedia.Org/wiki/multifunction_cardiogram.