I'm wondering if your gastric/transit issues may have something to do with that reaction.

Certainly what Mrs. D describes factors in, but in your case, I speculate that since the "glop" is one of the few thinigs your system can handle easily, it is rapidly absorbed by your hungry body cells--too rapidly--and you get a very quick spike and a very quick "crash". And then, of course, when due to the requirements of the test, you can't eat for a considerable while, you get those severe hypoglycemic symptoms . . .

Again, did they ever do the test with insulin levels as well? That might be instructive . . .do you have any numbers from any of these tests you can tell us?

One of the other things I wonder is, given your situation, just how much, or how little, glycogen you would have stored in your liver that could be released to offset such crashes. I'm thinking not a lot, as we know you're not exactly absorbing a lot of nutrition in general . . .in fact, more broadly, I would suspect you'd be prone to reactive symptoms of low blood sugar just day to day--does that seem to happen at times?