Hi welcome to health care magic... Following can be possible causese for bloating .... -High fatty food intake -smoking -excess stress -celiac disease -lactose intolerance -irritable bowel syndrome Let me know you gluten free and Lactose free diet show no improvement so celiac disease and lactose intolerance not there Stress, smoking , alcohol avoided if you have that factors present ... Your most likely cause seems functional bowel disease ... Include more fruits in routine day .. Fiber foods and fiber supplement useful... Stress if present should be avoided as it can precipitate condition... If your bloating not improving than USG or endoscopy procedure needed for further work up.... Take care Advise : physician or gastroenterologist consultation for examination....