I am so sorry to hear about all your suffering.
I had a botched surgery, perforation of the duodenum from ERCP with stent.
Your pain symptoms, ( very sorry to say, sound like a perforation, or free air in the intestine.) Please go back to the ER immediately, please request to be seen by a different gastro DR and different surgeon. My chest pains mimic ed a heart attack.
God Bless You.
Praying someone gets to the bottom of this.