I find that if things slow down raising my calories to maintenance and lowering the intensity but not duration of my workout for two or three days helps to get things moving again. So, I eat about 300 calories more - i.e. an extra snack during the day, and instead of doing 30mins of fast front crawl I do 30 mins moderate breast stroke, or instead of doing effort level 10 on the cross trainer I switch down to about level 6.
Also - weirdly, I've had two stalls in loss since starting, and both times I ate a fairly hot curry and the next day had dropped more than half a pound! They say chilli speeds up your metabolism...You could try it! Of course, it might just have been a coincidence...
Then again, all bodies work in their own special ways, it seems, so this may not help you. But if you're at a complete standstill it can't hurt to try?!