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How long the symptoms are present? How frequently the pain is coming? Can you elaborate the precise site of pain( which side, right or left), any radiation to other place & if so, where? Is there any aggravating or relieving factor or any relation to food? How are stool & urine? Is there any area of tenderness? Are there other related symptoms? Was any test taken? Is there any significant past illness?
The pain in lower abdomen can come from a few causes. Appendicitis (if not operated already) needs to be ruled out. Urinary infection, or stone can cause pain here. Colitis or inflammation of intestines can cause it. Gas can form from inflammation. It can result from constipation too but your stool & urine are normal. Pain may be referred to right shoulder from gall bladder pain. But that is usually felt in upper abdomen. I would advise to take an examination by doctor when the abdomen is distended. Doctor can run tests like urine, blood analysis, ultrasound etc. if doctor feels necessary after clinical examination.