The gal bladder if blocked expands and sometimes puts pressure on the digestive tract and forms a little shelf. Sickness is the result and feeling sick as the food is not going through as it should. Another gal bladder patient told me the surgeon had told her.
It seems to me that lack of information and dialogue between patient doctor and surgeon is a terrible problem. If they explained clearly then we could help ourselves a lot more.
When I had my stomach rebuilt and put back in place the surgeon told me to have a small glass of Lambrusco with food, when I was back on solid food, not lemonade, too much fizz. Lambrusco has just enough fizz to agitate the food to get it moving. If you do not approve take a glass of fizzy and add a little water to kill some of the fizz. Could try it might help.
Lilly have you had a barium meal to look for a hiatus hernia. The pain you describe in your shoulder, like heart attack symptoms, sickness etc is like hiatus. The white excruciating pain from that comes out in the most unbelievable places, face, shoulders, chest, stomach and arms. I am not a doctor and they might have already considered that with the other tests. Most people do not need surgery for it as medication can control the symptoms of Hiatus Hernia unless it has complications.