Why why why do I do it to myself?

You are certainly not the only one. I did the very same thing yesterday and I never do it. My daughter’s birthday was yesterday and I always cut just enough cake for myself so I can get about 4 or 5 bites. In the evening, I decided I needed another 4 or 5 bites and ended up eating about 20! I woke up with such a severe headache about 4am and my sugar was 389. I’m so dissappointed and mad at myself today. I have it back down thanks to my insulin but I hate being so out of control.