Girls, help! My daughter has been crying for two days, fussing, scream…

Girls, help! My daughter has been crying for two days, fussing, screaming, and can't sleep at night, she can't go potty, we did a microclimate treatment, she went potty but is still crying and screaming. I can't emotionally handle it anymore, I don't know how to help her. We saw a surgeon, he said mom is to blame, needs to get her diet back on track. The pediatrician shrugs, like "tough luck". How do you tough luck when she can't go to the bathroom? Suggest something, maybe an ultrasound or something... ?