Well, it wasn't the curry. I've tried it, no reaction at all, for which I'm very grateful. I guess now I need to try the buckwheat, just to be sure, but I'm going to wait until I have a day I can spend at home on the toilet, just in case.
Of course, as ViewAskew pointed out, it could have been something else, though it sure did seem like a gluten reaction to me.
Hugs,