Have you had any abdominal imaging done since the second surgery? It would seem to me that any barium that calcified at the time would HAVE to have moved on thru by now. I would think if it hasn't moved thru then you would be obstructed again. One or the other. I would further guess that the pain you are now encountering is more likely from narrowing at the resection site(s). Or active disease.
Personally I would drop the idea that there was still calcified barium in the intestines causing your current pain when talking w/new gastros and with Mayo and CC, etc. That could work against you and make them a little leery and nervous about
you and being involved in some malpractice suit. Once you are established w/them you could then eventually bring it up as a possible cause of your current pain.
Its rather in some ways like asking for heavy duty pain meds your initial visit w/a new doctor - it makes them very very leery of taking you on as a patient.
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.