Since you have stomach cramps and aches and pains, Crohn’s, IBS and food allergies need to be ruled out. Pain
at the left shoulder blade is usually a referred pain
from abdomen like stomach ulcers, acidity, pancreatitis, or from the chest like in heart attack, pericarditis, pleuritis, pneumonia, pulmonary embolus, and aortic dissection. Since you also have chest pain, heart causes and lung causes need to be ruled out too.