When I was dropping, I played with the same 4 pounds for the better part of 4 month. Yeah it sucks.
I also had a really great COD staff who had all lost massive weight on LA and kept it off, so they were beyond sympathetich and idea filled when it came to my frustrations. I was actually instructed to spend a day totally ignoring plan, to go out and eat chinese food or a cheeseburger, to do what my body craved. It worked, I broke the 4 pound barrier, only to go right back to it when I went into stabilization.
Try upping your water, I actually find that now when I'm slumping that's what my savior is. I just switched hours at work, and now that I'm not wheeling my crap through the store with me, I'm not drinking nearly as much water as I used to, and it makes a major difference. Especially with eating restuarant meals when traveling, the water will flush out the excess salt and that sometimes makes a major difference.