I would really recommend looking at the Radiant Recovery website which I linked to in my post upthread.
If you are bf'ing, it says you should eat (and that means protein + carbs) every 3 hours - so 3 meals a day, and a mid-morning, mid-afternoon and pre-bedtime snack. It has made a HUGE difference to my physical / mental / emotional wellbeing. DH has started eating more protein at lunchtime and is amazed that he's not half as sleepy in the afternoons now.
The plan is designed so that you make changes gradually, and you don't try to do things like swap to wholemeal straight away, as that often just sets off more cravings for white carbs and you end up bingeing on sugar again. You stabilise your brain before making those changes - and it makes it much easier. I gave up sugar once before, but it had no effect on my energy levels. Now I've reduced my sugar intake through the plan (not got as far as cutting it out yet) and it's made an incredible difference.
The proteins I currently eat are: sunflower seeds, hemp seeds (nuts are good too), eggs (3 eggs for one meal for me, but how much you should eat will depend on your bodyweight), beans (including baked beans), lentils, cheese, meat). My out-and-about snacks are hardboiled eggs, seeds, cheese sandwiches or even a milkshake with cottage cheese & fruit in it.
Filling carbs include brown rice, wholemeal pasta, wholemeal bread, potatoes with skin on, grains like quinoa and polenta, beans and lentils. Adding vegetables (rather than fruit) will slow down your digestion and help reduce the swings in your blood sugar levels.
AFAIK Most sugar replacements are supposed to have the same effect on the brain as actual sugar, and they cause you to continue to crave sweet things, so they may not help.