A lot of times we blame ourselves when blood sugars are higher or lower than we like, but it isn't always the case that it's something we've done to cause it. (You've heard of blood sugar fairies, right?)
We can come down pretty hard on ourselves at times like that, and it helps me when I remember that it's not always my "fault". It also helps me when I can have a little bit of fun attacking the very robot parts that keep me alive.
Sometimes you just need to let it all out.