This is a pretty simple surgery that any general surgeon can do. They do not go into the abdominal cavity and mess with your intestines, other than to free up the organs from adhesions that may have formed to the area around the hernia. They may do a cursory “look around” to make sure all is well, but nothing like what was done for your j-pouch or ileostomy.
The mesh is used to add strength to the abdominal wall fascia, so that the hernia does not recur. This surgery can be done on an outpatient basis without a overnight stay. It all depends on your history and condition. There is no NG tube. You should be back to a regular diet quickly, as there is little to no risk of an ileus, since there is minimal manipulation of the gut. You will be advised to take it easy with lifting and exercise for about six weeks, and you should not need pain meds stronger than Vicodin or a few Percocets. But, you can be up walking right away, and you should resume that sort of activity.
Hope that helps and I hope you get it taken care of quickly!
Jan 