I'm sorry you are in such a difficult and stressful situation. Chest pain sucks. I'm sorry they haven't found the cause. Try to follow up with the GI just in case. Once I knew a fellow who had chest pain pretty bad and it turned out to be something like he was really constipated. His stomach didn't hurt but he wasn't completely going when he went and it like built up. Gross I know. But hopefully it is something fixable like that.