I notice that I get blood sugar disturbances when I first reintroduce something new to my diet. The first time I ate apples, I got this shaky/nervous irritable feeling (this was my personal recollection of what low blood sugar felt like). I was really depressed about that, since I love apples. However, I tried eating them again and I don't get that feeling anymore at all.

I think when we start to use more sugar again, we kind of go into a "reverse induction" mode. Your body isn't used to it, and it needs to adapt, just as it did before when we went on induction.

Try again tomorrow, and this time drink a little carb countdown milk for protein, and add nuts to your cheese for fat. If you still feel like your blood sugar is messed up, then maybe you should avoid this particular item.