Hi Jerry, I had this brain fog too.
The way I solved it was to eat when I felt it coming on, but eat LC, so mainly fat and protein - I made almond muffins and snacked on them whenever I felt like this.
This seemed to sort it for me - like you, I was all for giving in, it was so bad.
If upping your carbs fixes it for you, I know what you mean about slowing the weight loss so much you'll give in - but what about just seeing this as the way you'll eat for good now, find nice things you can eat so you don't mind that too much and just plod on. After all, you're going to reach next year anyway (god willing) so you may as well get there thinner than not.

I'm beginning to think about maintenance (my DH is there and I'm going to be soon, hopefully). We've decided to stay off anything with a high glycemic index, cos those are the things that give us cravings and overcome the will power.
Sure, there are some goodies we won't ever eat again, but its not that restrictive and looking and feeling good makes up for them.

Take care, hope you find your answer, Jay