I'm sorry you've been hurting and not getting relief.
The ER is only there to either admit a patient to the hosptial or to stabilize a patient for discharge, not to diagnose, so anytime you have to go there be sure to follow up with your doctor.
It does sound like something gastroenteric. I hope you will make an appointment with a gastroenterologist soon. It could be many things, including GERD, Hiatus Hernia, Pancreas disorder, Gastritis, Esophagus disorders, and a host of other GI diagnoses.
You deserve to feel better. I hope you'll make an appointment soon! Please let us know how you are doing.
I'll be thinking of you!