The most effective tool I've ever found for appetite control is to eat a good sized breakfast that consists of at least 30g of protein - ideally with a decent amount of fat and minimal carbs - within an hour of waking up. I couldn't believe how, after just a few days, my appetite had waned and was totally under control without any effort. I felt satisfied after eating and was able to get through the day without feeling like I was starving and in need of a snack to get me through to the next meal - I wasn't even thinking about food at all. Spacing my meals 5 (and often 6) hours apart was also very effective and totally do-able after sticking to the breakfast regimen religiously, although that may be too long while nursing - you'll know after trying it for a while. The great thing was that I wasn't having to "tough it out" to do it, either. I ate, was satisfied, and then was on to the next thing on the to-do list of the day.
The effects of this have been huge for many. (I first learned of it by reading the gigantic Leptin Reset thread that was big for quite a while around here and there's definitely something to it) After doing this every day for a while, the urge to snack was non-existent, even at night, which is huge in itself! When I've gravitated away from doing this for whatever reason, I start to have issues with hunger and not feeling satisfied for long even after a well rounded, good sized meal. Nighttime "snackiness" comes right back almost instantly and I'm not able to go too long between meals without really forcing myself, which is where I think most of us start to get into trouble...
Try it for at least a week or two! I think you'll be pleasantly surprised.
Life is not a matter of having good cards, but of playing a poor hand well.
- Robert Louis Stevenson