Horsewoman, have you experimented with taking digestive enzymes? Maybe it would help the stabilizing? I use these two, again, an all purpose enzyme and specific for gluten:
Doctor's Best, Best Digestive Enzymes, All Vegetarian, 90 Veggie Caps - iHerb.com
Enzymedica, GlutenEase, Digestive, 60 Capsules - iHerb.com (ja)
I think there are also products that help stabilize blood sugar levels.