Hi. Thanks for your query. You have got a history of Pain in lower abdomen, bloating, gas release on laying on sides, takes hours to go away. The probable causes of such a problems area: Aerophagia, meaning inadvertent swallowing of the air. Using too much of carbonated drinks Stress and anxiety Irritable Bowel Syndrome. Intestinal infection with gas producing bacteria and disturbance of normal intestinal flora. -Somatic causes like- subacute intestinal obstruction. Cancer of the intestine Some specific diseases like tuberculosis. I would advise you the foolowing: First of all, getr a clinical evaluation and physical examination bya Gastroentrologist or a Surgeon. X-ray of the abdomen in standing position tests of blood, urine and stool. Ultrasonography of the abdomen. A course of an antibiotic, metronidazole, probiotic and activated charcoal tablets for 5 days and see the response. Ct scan of theabdomen Endoscopy for stomach and colonoscopy. All these things will help the diagnosis and get an obvious diagnosis and mode of treatment.