Maltitol, malto-dextrose, maltodextrin are entirely different animals. I'd bet it's the sugar alcohols that are causing your problems.
These types of technical pronouncements are beyond my capacity to respond.
It is sad to of hear of so many people suffering GI problems. I have recently experienced life threatening medical issues that involved the blood, heart and intestines. It was interesting to hear about my condition from doctors of differing fields. Each perspective gave more importance to each selected medical issue.