Yes. Mood swings is classic symptom in alcohol withdrawal.
Alcohol withdrawl. Yes. Stomach and other body pains are typical.
No. Nausea, vomiting and diarrhea may occur in withdrawal, and sometimes repeated vomiting will result in stomach pain, and diarrhea may be associated with cramping. Alcoholics, however, do have much more likelihood of gastritis, pancreatitis and alcoholic hepatitis, all of which can cause pain, and it can worsen peptic ulcer and cause bleeding as well. This should be evaluated by a physician asap.