A leak should definitely be ruled out, but the pain may also be due to adhesions. I have them in the area of the stoma, and I have had partial obstructions in the past. The gurgling noises can be quite loud and every so often, I am aware of stool passing through the area and it is momentarily painful. For adhesions, surgery is usually only done as a last resort, as any abdominal surgery can lead to more adhesions so you may only end up exacerbating the problem. I hope you can get it sorted out!