You bad girl!! I'll scold you even if no one else will! You know what your problem is Barbie? You're too nice!! You didn't want to hurt her feelings so you hurt yourself instead!!!!!!! Gotta learn that "No, thank you" is a complete sentence. If they push, say "I'm sorry but I can't eat that for medical reasons. It looks lovely and I'm sure it's delicious but I'm not allowed. Thanks anyway."
Maybe you'll get lucky this time and it won't make you too sick. I hope not, sweetie pie, since you were just being sweet. Oooh, and too bad about the knees and back. Ouuccchhh.
Feel better, honey pie! (I have to add that I always used to hate those 50 year old women that called everyone sweetie and hon -- AND NOW I'M ONE!!!!!!! Too funny!)