Your condition sounds very complex. I am not sure you should focus entirely on bariatric surgery as being the cause, although it is known to cause intussusception. Still, as you already know, it is very rare.
I'm not a doctor and certainly not qualified to give medical advice. I would at this point be seeking a specialist at a different hospital. My experience with doctors is that they are very protective of each other and will rarely fix someone else's mistake if there is one.
I believe you should inform your current health care provider that you wish to get an expert opinion from a gastroenterologist at a prominent Medical Center such as the Mayo Clinic, which has a campus relatively close to you but may not be as populated with skilled Physicians and students as the main Hospital in Minnesota.
Whatever you choose to do, it seems obvious to me that you shouldn't be doing it at a place that has done surgery on you 5 times already without curing the problem. You may need more involved testing. By attributing the origin of the cause to bariatric surgery, you may be closing off an Avenue that will lead you to a cure.
In any event, I think that surgery needs to stop being so exploratory and become the way to cure the root problem. You've already had the worst thing happened to you by having to have part of your bowel removed because of gangrene. I would run, not walk, to a different medical facility because it just isn't right that your entire bowel cannot be evaluated and any problems fixed in one surgery.
No one in this group can help you except to urge you to find a competent gastroenterologist, and to do so soon. I hope that's what you do because your problems are very worrisome.
In the meantime, I hope you will find some answers here to questions you may not have asked already. You certainly have our support. Welcome and please keep us posted on your progress.